Daemon's Tail 
Effects
Notes
- Objects and items such as tinted rocks, Red Chests, Fortune Telling Machines, tarot cards, (Little C.H.A.D.) Little C.H.A.D.,
Bloody Penny, or Blue Fire Places can't drop Black Hearts. Thus, they will still drop Soul/Red Hearts with Daemon's Tail.
- All heart drops from (Added in Afterbirth †)(Ace of Hearts) Ace of Hearts will be Black Hearts.
- Sources of heart drops that are reduced include cleared rooms, bosses, Slot Machines, Fortune Telling Machines, Beggars, Fire Places, Chests, Red Chests, poops, tinted rocks, items ((Gimpy) Gimpy, (Old Bandage) Old Bandage, (Fanny Pack) Fanny Pack), trinkets ( Bloody Penny), and familiars ((Little C.H.A.D.) Little C.H.A.D., (The Relic) The Relic, etc).
- Hearts that are present upon entering a room for the first time are unaffected by the reduction (for example, the ones found in Curse/Devil/Angel Rooms), but will be converted to Black Hearts.
- The exceptions to this are particular Super Secret Rooms, which have the effect of forcing all heart drops to be the kind found within them.
- The (V - The Hierophant) V - The Hierophant and (VI - The Lovers) VI - The Lovers tarot cards have a chance to drop one heart instead of two. The hearts they drop will not be Black Hearts.
- (Added in Afterbirth †) The cards drop two of their respective hearts every time.
- Things that can drop pickups other than hearts will keep the same chance to drop a consumable, but with an increased chance for drops other than hearts and a decreased chance for heart drops. In particular, this increases the chances of acquiring:
Synergies
- (Added in Afterbirth)
Black Feather: Black Feather grants a damage boost for Daemon's Tail, provided the player has an extra trinket slot or has gulped/smelted either of the trinkets.