What does the Mitre do?
According to the wiki, the Mitre "greatly increases the chance of replacing spawned hearts with Soul Hearts." In addition, it may increase the probability of encountering an Angel Room, but that seems to be unconfirmed.
According to the wiki, the Mitre "greatly increases the chance of replacing spawned hearts with Soul Hearts." In addition, it may increase the probability of encountering an Angel Room, but that seems to be unconfirmed.