Radiant Edge of Night

radiant

At 60% Health, briefly become untargetable, shed negative effects, and heal all missing health.

Source

Heal

Restores Health to a unit, capped at maximum HP.
Untargetable

Protective state where the unit stops being a valid target — effects that have to pick a target, including basic attacks and ability targeting, cannot select it. Effects already on the unit keep running, and it stays visible on the board. Distinct from invulnerability (which blocks damage but still allows targeting); often triggered by HP-threshold trait passives or item effects.