Passive Item Mechanics (Slay the Spire Inspired)

I've got an idea for a RPG that's main mechanic is passive effects given through Items held. (Not equipped.) Things like: Heal x after battle. Summon x after defeating an enemy. First spell cast each combat cost 0 mana. Etc. I've been going through plugins and I am not seeing anything that is really going to help with some of these ideas. I'm starting to wonder if this mechanic might be too much, but was wondering if anyone had some insight on these things?

Hopefully I posted this in the right spot. >.<

I think you need support so I'm going to move it there for now.

You've just gotta be a little clever. Try a conditional passive state plugin of some kind and have it conditioned on the item being in the players inventory. You can ofcourse also event it with a battle event in each troop that checks for the item every turn. Most things are up to what exactly it is you want to do and how.

There's a way Some ways event this thing :
Create a troop event ( Not sure if it's called Troop event )
Create loop or anything that repeats checking
In conditional branches check for item you want
Create item effect like inside conditional branch
Copy it and paste it in every troop