Bleed is a system in Basement Moon, a mod for The Binding of Isaac.
A keyword with Potency and Count, each capped at 99. Potency appears to the left of its icon and Count to the right. Gaining only one value also supplies a minimum of 1 of the other value.
Every 15 hits received while afflicted, an enemy takes extra damage equal to Bleed Potency and loses 1 Count. Bleed's own extra hit does not advance this hit counter.
If Isaac is afflicted with Bleed, each active enemy's death deals (Potency / 9, rounded up) half-Hearts of damage to Isaac and consumes 1 Count.
Bleed ends when Count reaches 0.