Reaper

Reaper is a 2-Energy Ironclad rare attack that deals 4 damage to all enemies (5 upgraded) and heals HP equal to the unblocked damage dealt. The healing mechanic is the real value: if three enemies each take 4 unblocked damage, you heal 12 HP. Reaper is the Ironclad's best HP sustain tool, and in multi-enemy fights with unblocked damage, it can recover significant health while also contributing to combat.

Reaper works best in group fights where multiple unblocked hits translate into big healing numbers. It synergizes with Hemokinesis (offsetting the HP cost), Strength (increasing per-hit damage and thus healing), and any build that relies on HP as a resource. It's less impressive against single targets with high Block. Upgraded at 5 damage per enemy, the healing output improves meaningfully.