Any luck/chance based effect - Double chance to occur (for example The Mulligan goes 16% chance to 32% or Metal Plate 25% chance to block a shot up to 50%) basically anything with a % in its description on isaacguru.com it gets doubled

Chocolate Milk - Allow the damage at full charge to be higher
X-Ray Vision - unlocks boss rush and hush door
Loki's Horns - Shoot 4 diagonal tears too
Spelunker Hat - See rooms even further away
Lump of Coal - Increase distance damage scaling
Guppy's Tail - Chance for old chests and wooden chests
Mom's Purse - Additional trinket slot
Scapular - triggers at 2 hearts left
Infestation - Spawn more files on hit
Bloody Lust - Increase stats given on hit
3 Dollar Bill - Cycle effects faster
Mom's Key - effects red and old chests
Gnawed Leaf - Need to stand still for less time to active
Rubber Cement - +range and +1 bounce
Stop Watch - even slower
Contract from below - +1 room drop
BFFS! - even bigger and higher damage familiars
Hive Mind - even stronger flies and spiders
Holy Mantle - Grants +1 shield per
Strange Attractor - strong magnet effect
Car Battery - +1 active use
Dead Eye - Damage stacks higher
No. 2 - Bombs drop after less time
Purity - have more that one aura at a time
Lusty Blood - damage stacks higher
Kidney Stone - Fire more of the Kidney stone tears
Lead Pencil - Less tears before shot
Dead Tooth - Aura size increase
Polydactlyl - More card/pill space
Contagion - +1 enemy is contagious
Jacob's Ladder - Electric travels further
Camo Undies - Stats last longer
Jumper Cables - less enemies before getting a charge
Death's List - +1 enemy on the list
School Bag - +1 Active slot
Blanket - Holy mantle each floor too
Brittle Bones - More tears per bone heart lost
Eye Sores - More tears
120 Volt - Larger range
Divine Intervention - Less recharge time
Monstrance - Larger size
Stairway - Ladder does not disappear
Voodoo Head - +1 curse room
Member Card - +1 trap door shop
Akeldama - More tears
4.5 Volt - Faster charging
Giant Cell - More minisaacs on hit
Card Reading - Spawn +1 portal choice
Tooth and Nail - Longer invincibility
Cracked Orb - More rooms revealed on hit
Empty Heart - +1 heart per floor
Bone Spurs - More bones
Glitched Crown - Cycles between more items
Sacred Orb - less chance for quality 2
Heartbreak - More damage per broken heart
Echo Chamber - Remembers +1 card/pill
Isaacs Tomb - +1 chests
Vengeful Spirit - +1 spirit per hit

TheTurtleMelon, I’ll plan to try to implement some of these whenever I get the chance, although I’m not sure that I would know how to do all of these. This is my first Isaac mod I’ve ever made, but I’ll do my best . I think for luck based effects, it might be a good idea to increase the player’s luck by the item’s quality number or some formula like that.

Originally posted by kdogjake:

TheTurtleMelon, I’ll plan to try to implement some of these whenever I get the chance, although I’m not sure that I would know how to do all of these. This is my first Isaac mod I’ve ever made, but I’ll do my best :resmile:. I think for luck based effects, it might be a good idea to increase the player’s luck by the item’s quality number or some formula like that.

Completely understand yeah, in the binding of isaac discord server there is a channel for mod developers, perhaps they can help?

Originally posted by TheTurtleMelon:

Originally posted by kdogjake:

TheTurtleMelon, I’ll plan to try to implement some of these whenever I get the chance, although I’m not sure that I would know how to do all of these. This is my first Isaac mod I’ve ever made, but I’ll do my best . I think for luck based effects, it might be a good idea to increase the player’s luck by the item’s quality number or some formula like that.

Completely understand yeah, in the binding of isaac discord server there is a channel for mod developers, perhaps they can help?

Yeah. I haven't joined it yet, but I probably will once I hit a wall. I started this project as a challenge for myself, so I'm going to do all I can on my own.

that makes sense, good luck to ya! also just a note, the increasing luck idea might not work best as that would then effect luck based items that havent been stacked

Originally posted by TheTurtleMelon:

that makes sense, good luck to ya! also just a note, the increasing luck idea might not work best as that would then effect luck based items that havent been stacked

My thought was that the total luck increase would reward the player for stacking an item that wouldn't normally stack by providing benefits to the other luck-based items the player has, in addition to the item they are stacking. I thought it would be a good idea because stacking luck-based items is pretty unconventional normally.

Originally posted by kdogjake:

Originally posted by TheTurtleMelon:

that makes sense, good luck to ya! also just a note, the increasing luck idea might not work best as that would then effect luck based items that havent been stacked

My thought was that the total luck increase would reward the player for stacking an item that wouldn't normally stack by providing benefits to the other luck-based items the player has, in addition to the item they are stacking. I thought it would be a good idea because stacking luck-based items is pretty unconventional normally.

yeah but having a stack effect other items seems less than ideal, im not sure how the code works but i think its best to change the items base chance per stack or change how much luck is required to scale it up

Originally posted by TheTurtleMelon:

Originally posted by kdogjake:

My thought was that the total luck increase would reward the player for stacking an item that wouldn't normally stack by providing benefits to the other luck-based items the player has, in addition to the item they are stacking. I thought it would be a good idea because stacking luck-based items is pretty unconventional normally.

yeah but having a stack effect other items seems less than ideal, im not sure how the code works but i think its best to change the items base chance per stack or change how much luck is required to scale it up

i see. i'll try to do it like that if i can, but i'm not currently seeing a way to do that in the modding API. i wish there was a way to directly modify item characteristics/effects, but, as of right now, i don't see any way to do that.

ill do some research too, try get back to you

ok so apparently it’s possible to manually give tears that are fired a % chance to have an effect which would act as an added chance but with other stuff that isnt tear based its harder

Originally posted by TheTurtleMelon:

ok so apparently it’s possible to manually give tears that are fired a % chance to have that effect which would act as an added chance but with other stuff that isnt tear based its harder

yeah, i was having trouble with loki's horns for that reason. it would've been a lot easier if i could've edited the item's actual function, but what I had to do instead is get the formula from the wiki for its proc chance, and then use that to make a chance to shoot 4 tears in the additional directions

yeah it seems for some of these it would be a case of rewriting the actual item, still though, you are doing great so far and this is a cool challange to help learn modding while also making a mod ive been waiting for come to life!

Yeah. It's unfortunate, though, because I wish I could implement all of these awesome suggestions. Things like 3 Dollar Bill, Akeldama, and Camo Undies which are hardcoded to function the way they do with little-to-no support in the Modding API (to my knowledge) won't be possible to implement without some serious workarounds that I don't have the skill to implement.

I'll spend time working on what I can when I'm free. If you learn anything of note, it might be easier to send me a DM via twitter (@kd0gjake) than through this discussion forum, as steam notifications are kind of wack.

Fire Mind: The explosion and fire spawned gets bigger with every stack (I know increased proc chance makes more sense but this would be incredibly funny)

Chemical Peel: Applies to your right eye too, effectively giving all of your tears a flat +1 damage. More copies alternate between further buffing up the left and right sides.

Charm of the Vampire: An extra half-heart gained every 13 kills per-stack.

E. Coli: Turning an enemy into poop has a chance to spawn extra poops right next to them for every stack.

Eve's Mascara: Adds on an extra damage multiplier and tears down.

Fanny Pack: Gives an extra, separate drop chance for every stack. (I.E, getting hit with 3 Fanny Packs rolls for a drop 3 times, giving you a drop every time the roll succeeds)

Gimpy: Adds a flat 10% chance to drop an extra half soul heart on taking damage. The chance is increased by 10% every stack. (let's be real, this would be far and away the best item to dupe if it simply increased the base soul heart drop rate LMAO)

Goat Head (one-time): Spawns a portal in the starting room of every floor that takes you directly to the Devli/Angel deal. The portal never closes, and also spawns on floors that don't normally have deals.

Guppy's Tail: Chests have a small chance to drop an extra key alongside what they normally drop.

Hive Mind: When a friendly spider/fly dies, you have a small chance to automatically spawn a new spider/fly to replace it. Chance increases with more stacks.

Holy Mantle: More mantles! (seriously, why doesn't this stack)

Isaac's Heart: The heart gains a tiny, Mask of Infamy-like orbital that blocks shots.

Maggie's Bow: Extra red hearts healed.

Little Baggy: Pills have a greater chance to be Horse Pills.

not sure how possible these are to make in the api but here goes

Lost Soul - gives an extra payout

Starter Deck - chance for runes and reverse cards to replace cards

Sanguine Bond - chances to get a payout are increased, also you're more likely to get leviathan or an item

Trinity Shield - puts a second one behind you, a third copy gives one to the left of you, and then a fourth to the right, further copies do nothing

Humbleing Bundle - gives a 25% chance to duplicate the item payout upon clearing a room, stacks with Broken Modem working as 2 separate 25% chances

Godhead - gives another, smaller inner aura with deals a flat 4-5 damage per tick, sort of like how monstrance looks

Midas Touch - tears now have a small chance to do the effect with a yellow effect, alongside the contact petrification giving extra coins

Best Bud (if it doesn't already stack) - the orbital will always be active

Pay To Play - If you have keys, it will use them first

Crown of Light - gives an extra .5 multiplier when active

Binge Eater - gives the choice of a second, different food item, or removes tlhe speed down you get from binge eater items

Haemolacria - alongside the +1 damage it already gives, adds more tears from the tears that split

Polyphemus - a further flat +4 damage (sorta like the synergy with c section)