Here's a fourth trinket coming in the next update to Shattered Pixel Dungeon!
The exotic crystals give (almost) any potion or scroll you find a chance to be exotic. Exotic potions and scrolls are normally created though alchemy. They're generally stronger, but also have different effects, so this can change up consumable gameplay quite a bit.
Don't worry, this doesn't affect strength potions or upgrade scrolls.
This looks really useful! I think it will encourage players to use alchemy when not using this trinket too because they will realise how useful exotics are.