The Ectoheart is a permanent power-up item obtained from the Treasure Bag dropped from Polterghast. It increases the damage of the Adrenaline Mode buff by +15% and increases how much damage reduction the player gains when hit while the meter is full by +5%. There are 2 other items that function identically to this: the Electrolyte Gel Pack and the Starlight Fuel Cell. It can only be used once.
- The three items that increase the total damage the Rage Mode buff deals: the Mushroom Plasma Root, the Infernal Blood, and the Red Lightning Container.