diff --git a/features/eid_api.lua b/features/eid_api.lua
index 09cc87a7..dbbeb0d2 100644
--- a/features/eid_api.lua
+++ b/features/eid_api.lua
@@ -113,7 +113,7 @@ local dynamicSpriteCache = {} -- used to store sprite objects of collectible ico
 ---@field Quality integer
 ---@field Icon EID_Icon
 ---@field Entity Entity?
----@field ShowWhenUndefined boolean
+---@field ShowWhenUnidentified boolean?
 ---@field PermanentTextEnglish string?
 ---@field ItemType integer?
 ---@field ChargeType integer?
@@ -304,7 +304,7 @@ end
 --- EID:assignTransformation("collectible", 1, "My Transformation")
 --- ```
 --- <hr>
----@param targetType? EID_TypeVariantAlias @Alias for a `Type.Variant` of entity
+---@param targetType EID_TypeVariantAlias @Alias for a `Type.Variant` of entity
 ---@param targetIdentifier integer | string @If valid `targetType` is specified, `SubType` of the entity. Otherwise, the full entity identifier
 ---@param transformationString string @Transformation name
 function EID:assignTransformation(targetType, targetIdentifier, transformationString)
@@ -355,7 +355,7 @@ end
 ---EID:removeTransformation("collectible", 1, "My Transformation")
 ---```
 ---<hr>
----@param targetType? EID_TypeVariantAlias @Alias for a `Type.Variant` of entity
+---@param targetType EID_TypeVariantAlias @Alias for a `Type.Variant` of entity
 ---@param targetIdentifier integer | string @If valid `targetType` is specified, `SubType` of the entity. Otherwise, the full entity identifier
 ---@param transformationString string @Transformation name
 function EID:removeTransformation(targetType, targetIdentifier, transformationString)
@@ -469,7 +469,7 @@ end
 ---@see EID.hidePermanentText @Hides permanently displayed text object.
 ---@param descriptionObject EID_DescObj @Description object to display
 ---@param permName1 string
----@param permName2 string
+---@param permName2 string?
 function EID:displayPermanentText(descriptionObject, permName1, permName2)
 	descriptionObject.PermanentTextEnglish = EID:getDescriptionEntryEnglish(permName1, permName2)
 	EID.permanentDisplayTextObj = descriptionObject
@@ -601,7 +601,7 @@ end
 
 ---Returns the description object of the specified entity.
 ---Falls back to english if the objID isnt available
----@param Type EntityType
+---@param Type EntityType | integer
 ---@param Variant integer
 ---@param SubType integer
 ---@param entity? Entity
@@ -729,17 +729,17 @@ end
 ---Returns the specified object string in the current language.
 ---Falls back to english if it doesnt exist, unless `noFallback` is true
 ---@param objTable string
----@param objID? integer
+---@param objIdentifier? integer | string
 ---@param noFallback? boolean
 ---@return string
-function EID:getDescriptionEntry(objTable, objID, noFallback)
-	if not objID then
+function EID:getDescriptionEntry(objTable, objIdentifier, noFallback)
+	if not objIdentifier then
 		if noFallback then return EID.descriptions[EID:getLanguage()][objTable]
 		else return EID.descriptions[EID:getLanguage()][objTable] or EID.descriptions["en_us"][objTable] end
 	else
 		local translatedTable = EID.descriptions[EID:getLanguage()][objTable]
-		if noFallback then return translatedTable and translatedTable[objID]
-		else return (translatedTable and translatedTable[objID]) or (EID.descriptions["en_us"][objTable] and EID.descriptions["en_us"][objTable][objID]) end
+		if noFallback then return translatedTable and translatedTable[objIdentifier]
+		else return (translatedTable and translatedTable[objIdentifier]) or (EID.descriptions["en_us"][objTable] and EID.descriptions["en_us"][objTable][objIdentifier]) end
 	end
 end
 
@@ -913,12 +913,12 @@ end
 ---@param id PlayerType
 ---@return string?
 function EID:findPlayerName(id)
-	local found, entityPlayer = EID:PlayersHaveCharacter(id, false)
+	local _, entityPlayer = EID:PlayersHaveCharacter(id, false)
 	if entityPlayer then return entityPlayer:GetName() end
 end
 
 ---Returns the name of a pill based on the pilleffect id
----@param pillID PillEffect
+---@param pillID PillEffect | integer
 ---@param isHorsepill boolean
 ---@return string
 function EID:getPillName(pillID, isHorsepill)
@@ -1191,7 +1191,7 @@ end
 ---Searches through the given string and replaces Icon placeholders with icons.
 ---Returns 2 values. the string without the placeholders but with an accurate space between lines. And a table of all Inline Sprites
 ---@param text string
----@param renderBulletPointIcon boolean
+---@param renderBulletPointIcon boolean?
 ---@return string, [EID_Icon, integer, function?][]
 function EID:filterIconMarkup(text, renderBulletPointIcon)
 	local spriteTable = {}
@@ -1241,9 +1241,9 @@ end
 ---@param spriteObj Sprite
 ---@param posX integer
 ---@param posY integer
----@param callback fun(spriteObj: Sprite)
----@param animName string
----@param animFrame integer
+---@param callback fun(spriteObj: Sprite) | nil
+---@param animName string | nil
+---@param animFrame integer | nil
 function EID:renderIcon(spriteObj, posX, posY, callback, animName, animFrame)
 	spriteObj.Scale = Vector(EID.Scale, EID.Scale)
 	spriteObj.Color = Color(1, 1, 1, EID.Config["Transparency"], 0, 0, 0)
@@ -1487,7 +1487,7 @@ end
 ---@param position Vector
 ---@param scale Vector
 ---@param kcolor KColor
----@param renderBulletPointIcon boolean
+---@param renderBulletPointIcon boolean?
 ---@return KColor
 function EID:renderString(str, position, scale, kcolor, renderBulletPointIcon)
 	str = EID:replaceShortMarkupStrings(str)
@@ -1583,18 +1583,18 @@ function EID:SplitTVS(tvsString)
 end
 
 ---Checks if any player has a given item ID (or anyone is a given player ID)
----@param Type EntityType
----@param Var integer
----@param Sub integer
----@return boolean
+---@param Type string | integer | EntityType 
+---@param Var integer | nil
+---@param Sub integer | nil
+---@return boolean, EntityPlayer?, integer?
 function EID:PlayersHaveItem(Type, Var, Sub)
 	-- convert "5.100.69" format strings into type, var, sub
 	if type(Type) == "string" then
 		Type, Var, Sub = EID:SplitTVS(Type)
 	-- assume collectible if only Type was given
 	elseif Var == nil then Sub = Type; Type = 5; Var = 100 end
-	if Type == 1 then return EID:PlayersHaveCharacter(Sub)
-	elseif Type == 5 then
+	if Type == 1 and Sub then return EID:PlayersHaveCharacter(Sub)
+	elseif Type == 5 and Sub then
 		if Var == 100 then return EID:PlayersHaveCollectible(Sub)
 		elseif Var == 350 then return EID:PlayersHaveTrinket(Sub)
 		elseif Var == 300 then return EID:PlayersHaveCard(Sub)
@@ -1607,8 +1607,8 @@ end
 ---Checks if the given player has the given item ID (or is the given player ID)
 ---@param player EntityPlayer
 ---@param Type EntityType
----@param Var integer
----@param Sub integer
+---@param Var integer?
+---@param Sub integer?
 ---@return boolean
 function EID:PlayerHasItem(player, Type, Var, Sub)
 	-- convert "5.100.69" format strings into type, var, sub
@@ -1616,8 +1616,8 @@ function EID:PlayerHasItem(player, Type, Var, Sub)
 		Type, Var, Sub = EID:SplitTVS(Type)
 	-- assume collectible if only Type was given
 	elseif Var == nil then Sub = Type; Type = 5; Var = 100 end
-	if Type == 1 then return player:GetPlayerType() == Sub
-	elseif Type == 5 then
+	if Type == 1 and Sub then return player:GetPlayerType() == Sub
+	elseif Type == 5 and Sub then
 		if Var == 100 then return player:HasCollectible(Sub)
 		elseif Var == 350 then return player:HasTrinket(Sub)
 		elseif Var == 300 then return EID:PlayerHasCard(player, Sub)
@@ -1929,7 +1929,7 @@ end
 
 ---Converts a given table into a string containing the crafting icons of the table, which are also grouped to reduce render lag
 ---@param craftTable integer[] @Example: {1,1,1,2,2,3,3,3}
----@param indicateCompleteContent boolean
+---@param indicateCompleteContent boolean?
 ---@return string @Example: "3{{Crafting1}}2{{Crafting2}}3{{Crafting3}}"
 function EID:tableToCraftingIconsMerged(craftTable, indicateCompleteContent)
 	local sortedList = {table.unpack(craftTable)}
@@ -2062,7 +2062,7 @@ function EID:setEntityData(entity, str, value)
 end
 
 ---Function to fix font compatibility. Resets config font to a value compatible with your current language
----@param forceRefresh boolean
+---@param forceRefresh boolean | nil
 ---@return boolean @True if the font was changed
 function EID:fixDefinedFont(forceRefresh)
 	local curLang = EID:getLanguage()
@@ -2293,7 +2293,7 @@ end
 ---Returns true if any player is pressing the given button (you can also specify any of the input functions)
 ---@generic BTN
 ---@param button BTN
----@param inputFunc fun(button: BTN, playerIndex: integer): boolean
+---@param inputFunc nil | fun(button: BTN, playerIndex: integer): boolean
 ---@return boolean, integer?
 function EID:PlayersActionPressed(button, inputFunc)
 	inputFunc = inputFunc or Input.IsActionPressed
@@ -2903,7 +2903,7 @@ function EID:UpdateAllPlayerLemegetonWisps()
 		end
 	end
 	-- Sort wisps by age (newest first), and leave just the IDs
-	for playerNum,wisps in pairs(EID.WispsPerPlayer) do
+	for playerNum, wisps in pairs(EID.WispsPerPlayer) do
 		table.sort(wisps, function(a, b) return a.FrameCount < b.FrameCount end)
 		for i,v in ipairs(wisps) do wisps[i] = v.SubType end
 	end
@@ -2916,7 +2916,7 @@ EID.GlitchedCrownCheck = {}
 function EID:WatchForGlitchedCrown()
 	if REPENTOGON then
 		-- In REPENTOGON, always check even without Glitched Crown, allowing to check 5+ Soul of Isaac usage, or Everything Jar
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		EID.GlitchedCrownCheck[curRoomIndex] = EID.GlitchedCrownCheck[curRoomIndex] or {}
 
 		for _, entity in ipairs(Isaac.FindByType(5, 100, -1, true, false)) do
@@ -2935,7 +2935,7 @@ function EID:WatchForGlitchedCrown()
 	else
 		if not EID.collectiblesOwned[689] then return end
 
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		EID.GlitchedCrownCheck[curRoomIndex] = EID.GlitchedCrownCheck[curRoomIndex] or {}
 		
 		for _, entity in ipairs(Isaac.FindByType(5, 100, -1, true, false)) do
@@ -2954,8 +2954,8 @@ end
 ---Example: "My {1} message" --> "My test message"
 ---varID can be omitted to replace {1} (or pass in a string table, to replace {1}, {2}, etc.)
 ---@param str string
----@param varID integer | integer[]
----@param newString? string | string[]
+---@param varID integer | integer[] | string | string[]
+---@param newString? string | string[] | integer
 function EID:ReplaceVariableStr(str, varID, newString)
 	if newString == nil then
 		newString = varID ---@diagnostic disable-line
@@ -3019,7 +3019,7 @@ end
 
 ---Simple decimal rounding, instead of just floor or ceil
 ---@param num number
----@param dp integer
+---@param dp integer?
 ---@return number
 function EID:SimpleRound(num, dp)
 	dp = dp or 2
diff --git a/features/eid_conditionals_funcs.lua b/features/eid_conditionals_funcs.lua
index cf7e503a..638c3944 100644
--- a/features/eid_conditionals_funcs.lua
+++ b/features/eid_conditionals_funcs.lua
@@ -310,8 +310,8 @@ function EID:ClosestCharCheck(modifierText, playerTypes, includeTainted)
 	end
 	
 	-- The closest player does not apply the modifier; check for players that do get this modifier
-	for i = 1, #EID.coopAllPlayers do
-		local t = EID.coopAllPlayers[i]:GetPlayerType()
+	for _, player in ipairs(EID.coopAllPlayers) do
+		local t = player:GetPlayerType()
 		if EID:ArrayContains(playerTypes, t) or (includeTainted and EID:ArrayContains(playerTypes, EID.TaintedToRegularID[t])) then
 			table.insert(EID.DifferentEffectPlayers, t)
 		end
@@ -320,8 +320,7 @@ function EID:ClosestCharCheck(modifierText, playerTypes, includeTainted)
 end
 
 function EID:PlayersHaveGoldenBomb()
-	for i = 1, #EID.coopAllPlayers do
-		local player = EID.coopAllPlayers[i]
+	for _, player in ipairs(EID.coopAllPlayers) do
 		if player:HasGoldenBomb() then
 			return true
 		end
@@ -364,8 +363,7 @@ function EID:CheckForNoRedHealthPlayer()
 		local player = EID.ItemReminderPlayerEntity
 		return EID.NoRedHeartsPlayerIDs[player:GetPlayerType()]
 	else
-		for i = 1, #EID.coopAllPlayers do
-			local player = EID.coopAllPlayers[i]
+		for _, player in ipairs(EID.coopAllPlayers) do
 			if EID.NoRedHeartsPlayerIDs[player:GetPlayerType()] then
 				return true
 			end
@@ -379,8 +377,7 @@ function EID:CheckForTaintedPlayer()
 		local player = EID.ItemReminderPlayerEntity
 		return EID.TaintedIDs[player:GetPlayerType()]
 	else
-		for i = 1, #EID.coopAllPlayers do
-			local player = EID.coopAllPlayers[i]
+		for _, player in ipairs(EID.coopAllPlayers) do
 			if EID.TaintedIDs[player:GetPlayerType()] then
 				return true
 			end
@@ -390,15 +387,14 @@ function EID:CheckForTaintedPlayer()
 end
 
 -- Check if we have characters with Schoolbag or a pocket active item
-function EID:CheckForMultipleActives(descObj, onlyChargeablePockets)
+function EID:CheckForMultipleActives(_, onlyChargeablePockets)
 	if EID.InsideItemReminder then
 		local player = EID.ItemReminderPlayerEntity
 		if player:HasCollectible(534) then return 534 end
 		local id = player:GetPlayerType()
 		if EID.isRepentance and (EID.PocketActivePlayerIDs[id] == 0 or (not onlyChargeablePockets and EID.PocketActivePlayerIDs[id])) then return player:GetActiveItem(2) end
 	else
-		for i = 1, #EID.coopAllPlayers do
-			local player = EID.coopAllPlayers[i]
+		for _, player in ipairs(EID.coopAllPlayers) do
 			if player:HasCollectible(534) then return 534 end
 			local id = player:GetPlayerType()
 			if EID.isRepentance and (EID.PocketActivePlayerIDs[id] == 0 or (not onlyChargeablePockets and EID.PocketActivePlayerIDs[id])) then return player:GetActiveItem(2) end
@@ -416,8 +412,7 @@ function EID:CheckForPocketActives()
 		local player = EID.ItemReminderPlayerEntity
 		return EID.PocketActivePlayerIDs[player:GetPlayerType()]
 	else
-		for i = 1, #EID.coopAllPlayers do
-			local player = EID.coopAllPlayers[i]
+		for _, player in ipairs(EID.coopAllPlayers) do
 			if EID.PocketActivePlayerIDs[player:GetPlayerType()] then return true end
 		end
 	end
@@ -430,14 +425,14 @@ function EID:CheckForCarBattery(descObj)
 	return descObj.ObjSubType
 end
 -- When we're looking at a Car Battery pedestal, check our actives for having an effect or no effect
-function EID:CheckActivesForCarBattery(descObj)
+function EID:CheckActivesForCarBattery(_)
 	if EID.InsideItemReminder then return false end
 	for k,v in pairs(EID.CarBatteryPedestalWhitelist) do
 		if v and EID:PlayersHaveCollectible(k) then return k end
 	end
 	return false
 end
-function EID:CheckActivesForNoCarBattery(descObj)
+function EID:CheckActivesForNoCarBattery(_)
 	if EID.InsideItemReminder then return false end
 	for k,v in pairs(EID.CarBatteryNoSynergy) do
 		if v and EID:PlayersHaveCollectible(k) then return k end
@@ -458,21 +453,21 @@ function EID:CheckForHiveMind(descObj)
 end
 
 -- When we're looking at a BFFS pedestal, check our familiars for having an effect (only finds the earliest one)
-function EID:CheckFamiliarsForBFFS(descObj)
+function EID:CheckFamiliarsForBFFS(_)
 	if EID.InsideItemReminder then return false end
 	for k,v in pairs(EID.BFFSPedestalWhitelist) do
 		if v and EID:PlayersHaveCollectible(k) then return "5.100." .. k end
 	end
 	return false
 end
-function EID:CheckFamiliarsForHiveMind(descObj)
+function EID:CheckFamiliarsForHiveMind(_)
 	if EID.InsideItemReminder then return false end
 	for k,v in pairs(EID.BFFSPedestalWhitelist) do
 		if EID.HiveMindFamiliars[k] and v and EID:PlayersHaveCollectible(k) then return "5.100." .. k end
 	end
 	return false
 end
-function EID:CheckFamiliarsForNoBFFS(descObj)
+function EID:CheckFamiliarsForNoBFFS(_)
 	if EID.InsideItemReminder then return false end
 	for k,v in pairs(EID.BFFSNoSynergy) do
 		if v and EID:PlayersHaveCollectible(k) then return k end
diff --git a/features/eid_modifiers.lua b/features/eid_modifiers.lua
index f2225b78..69de00df 100644
--- a/features/eid_modifiers.lua
+++ b/features/eid_modifiers.lua
@@ -14,10 +14,8 @@ function EID:TabReleased() return EID.TabHeldLastFrame and not EID.TabHeldThisFr
 -- List of collectible IDs for us to check if a player owns them; feel free to add to this in mods that add description modifiers!
 EID.collectiblesToCheck[CollectibleType.COLLECTIBLE_VOID] = true
 EID.collectiblesToCheck["5.300.41"] = true -- Black Rune
-local maxSlot = 1
 -- Repentance modifiers
 if EID.isRepentance then
-	maxSlot = 3
 	EID.collectiblesToCheck[CollectibleType.COLLECTIBLE_BOOK_OF_VIRTUES] = true
 	EID.collectiblesToCheck[CollectibleType.COLLECTIBLE_SPINDOWN_DICE] = true
 	EID.collectiblesToCheck[CollectibleType.COLLECTIBLE_MOMS_BOX] = true
@@ -920,7 +918,7 @@ if EID.isRepentance then
 	local function GlitchedCrownCallback(descObj)
 		if not descObj.Entity or inGlitchedCrown then return descObj end
 		local entity = descObj.Entity
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 
 		if EID.GlitchedCrownCheck[curRoomIndex] and EID.GlitchedCrownCheck[curRoomIndex][descObj.Entity.InitSeed .. descObj.Entity.Index] then
 			-- this table has collectible ID keys that define the first frame and most recent frame that that ID has been seen on this pedestal
diff --git a/main.lua b/main.lua
index 1a41bdbd..75d79c06 100644
--- a/main.lua
+++ b/main.lua
@@ -49,7 +49,7 @@ local pathsChecked = {}
 local altPathItemChecked = {}
 local alwaysUseLocalMode = false -- set to true after drawing a non-local mode description this frame
 EID.ForceRefreshCache = false -- set to true to force-refresh descriptions, currently used for potential transformation text changes
-EID.holdTabPlayer = 0
+EID.holdTabPlayer = nil
 EID.holdTabCounter = 0
 EID.DInfinityState = {}
 local forgottenDropTimer = 0
@@ -294,7 +294,7 @@ if EID.isRepentance then
 		-- (it also watches for item rerolls to fill the new entity's GetData)
 		-- POST_NEW_ROOM then handles putting the result in the entity's GetData
 		local curFrame = Isaac.GetFrameCount()
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		if curFrame == lastGetItemResult[2] then
 			if initialItemNext then lastGetItemResult[1] = selectedCollectible
 			elseif flipItemNext and lastGetItemResult[1] then
@@ -328,7 +328,7 @@ if EID.isRepentance then
 		flipItemNext = true
 		lastGetItemResult[4] = entity.InitSeed
 
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		local gridPos = game:GetRoom():GetGridIndex(entity.Position)
 
 		-- Update a Flip item's init seed after D6 rerolls or using Flip (aka Grid Index didn't change, Init Seed did)
@@ -355,7 +355,7 @@ if EID.isRepentance then
 		-- Only pedestals with indexes that were present at room load can be flip pedestals
 		-- Fixes shop restock machines and Diplopia... mostly. At least while you're in the room.
 		if EID:getEntityData(entity, "EID_FlipItemID") and entity.Index > EID.flipMaxIndex then
-			local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+			local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 			local gridPos = game:GetRoom():GetGridIndex(entity.Position)
 			local flipEntry = EID.flipItemPositions[curRoomIndex] and EID.flipItemPositions[curRoomIndex][entity.InitSeed]
 			-- only wipe the data if the grid index matches (so Diplopia pedestals don't)
@@ -370,7 +370,7 @@ if EID.isRepentance then
 		-- also, reload our descriptions due to transformation progress changing upon Flip
 		EID.ForceRefreshCache = true
 		lastFrameGridChecked = Isaac.GetFrameCount()
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		if EID.flipItemPositions[curRoomIndex] then
 			local pedestals = Isaac.FindByType(5, 100, -1, true, false)
 			for _, pedestal in ipairs(pedestals) do
@@ -775,7 +775,7 @@ EID.isDeathCertRoom = false
 if EID.isRepentance then
 	function EID:AssignFlipItems()
 		EID.flipMaxIndex = -1
-		local curRoomIndex = game:GetLevel():GetCurrentRoomDesc().ListIndex
+		local curRoomIndex = game:GetLevel():GetCurrentRoomIndex()
 		if EID.flipItemPositions[curRoomIndex] then
 			local pedestals = Isaac.FindByType(5, 100, -1, true, false)
 			for _, pedestal in ipairs(pedestals) do
@@ -895,7 +895,7 @@ function EID:renderIndicator(entity, playerNum)
 	end
 
 	-- Don't apply sprite.Color changes to Effects (Dice Floors, Card Reading Portals), use Arrow instead
-	if EID.Config["Indicator"] == "arrow" or entity.Type == 1000 or EID:IsGridEntity(entity) then
+	if EID.Config["Indicator"] == "arrow" or entity.Type == 1000 or sprite == nil then
 		ArrowSprite:RenderLayer(playerNum-1, arrowPos, nullVector, nullVector)
 	else
 		local colorMult = {1,1,1}