Chaos Device

Chaos Device is a sidequest head armor from the Experimental item set. While equipped, it opens the level-up pool to all classes and provides extra rerolls, letting the wearer cherry-pick powerful abilities that normally sit outside their class. The effect disappears with the item, so it's a temporary build-widening tool — complete the sidequest to earn the Chaos Controller, which makes multi-class level-ups a permanent fixture rather than a borrowed benefit.