Instant Damage

Instant Damage is a instant status effect which decreases health for living mobs and heals the undead.

Effect
Instantly inflicts damage of × 2level. Undead mobs (including the wither) are healed as if with Instant Health instead. Death is reported as " was killed by magic". If the effect is forced to last longer than 1 tick, it will damage entities every tick (with the exception of lingering potions, which damage only every second). Levels 30–32 provide no damage. Amplifiers outside the range 0–31 (corresponding to levels 1–32) are used modulo 32.

Immune mobs
Witches are highly resistant to instant damage, but not fully immune.