Pahan muisto

The Memory of Evil (in-game name Pahan muisto, lit. Memory of an evil thing), also known as the Heart Mimic is a rare mimic enemy, that uses its resemblance to a Extra Max Health pickup to lure in players and bite them, dealing 30–40 damage.

There is a 0.11% chance of finding them in a Treasure Chests. Currently there are no other confirmed ways to find them.