Eternal Death

Eternal Death (エターナルデス) is a level 90 undead monster and one of Momonga’s undead monsters in YGGDRASIL.

Abilities
Eternal Deaths are excellent undead to use because they have a passive skill called Aura of Death and Decay. In other words, it is a potent skill which combined the effects of Ainz's Despair Aura V and Despair Aura I, which made them capable of causing instant death and stat penalties to the enemy.

In particular, the stat penalty was not a mind-affecting ability. This allowed it to bypass immunity to mind-affecting effects, which made it very hard to deal with. That said, if this ability were used under conditions where friendly fire was enabled, it would swiftly paint a hellish picture of suffering and misery.

Trivia

 * Ainz requires two uses of Create High Tier Undead skill to summon it.