Heartworm

A worm lodged directly in the heart, with only 1 Durability before it's gone — but what it offers while present is remarkable. Heartworm provides LCK +3, a significant luck spike that amplifies crit rates and proc chances, and when the host eventually dies the AddCorpseHealth passive leaves behind a larger corpse. The single-charge nature means it won't last forever, but the immediate luck bonus makes it a strong early pickup for runs that rely on fortune-based effects or item procs.