Bloodied

A creature is Bloodied while it has half its Hit Points or fewer (round down). A creature at 0 HP is also Bloodied for the purposes of any rule that cares.

Why it matters: Bloodied is a status threshold many features key off. Examples include:

• Some monster abilities trigger or improve when the monster becomes Bloodied (a desperate berserker rage, a fleeing reaction)
• Certain class features grant bonuses against Bloodied targets
• Tactical narration cues: "The ogre is bloodied" is information the DM can volunteer to telegraph that the fight is past its midpoint

Checking the threshold: A creature is Bloodied the moment its HP drops to half or below. It stops being Bloodied if healing returns it above half. The threshold is recalculated against its current HP maximum, not the value at the start of the encounter, so temporary changes to max HP shift the line.

Visibility: Whether the party can tell a creature is Bloodied is up to the DM. By default, a creature in obvious pain (heavy wounds, slowed movement) reads as Bloodied without a check; a stoic foe might require a Perception or Medicine check.