Feed

Feed is a 1-Energy Ironclad rare attack that deals 10 damage (14 upgraded) and permanently increases your max HP by 3 (4 upgraded) if the attack kills the enemy. The permanent max HP gain is the real reason to pick Feed: over a full run, consistently landing killing blows with Feed can add 20-30+ max HP, dramatically improving your survivability in late-game encounters. It stacks indefinitely.

Feed rewards precise damage management: you want the enemy at 10 HP or less before playing it to secure the kill bonus. It's most reliable in smaller fights with multiple weaker enemies you can finish off, and less reliable against tough Elites or bosses who usually take several turns to kill. Over a full run with good targeting, Feed can push your max HP from 75 to over 100. A strong rare that improves your run without requiring specific synergies.