→Rotten Heart: Added half rotten heart qualities.
'''Rotten Hearts''' are infested red hearts which fill up a full heart container. If a Rotten Heart is picked up at full health, it will replace the rightmost red heart.
For each Rotten Heart possessed upon clearing a room, two [[boir:Blue Fly|blue flies]] will spawn.
You cannot have half a Rotten Heart ; they are always depleted in one hit.
Depleting a Rotten Heart will not count against Devil Deal Chance when it's the rightmost red heart.