Shalltear - Mana Essence

Wearing a sadistic smile, she cast Mana Essence. It allowed her to temporarily see how much magical energy the target, Ainz, had left. He really has a ton, huh? How did he get that much power? He had more than one and a half times the amount of MP she had. Look as one might, there was nobody in Nazarick with that much power. As befitting a Supreme One, he is truly a non-standard undead... Is he a super undead—no, a godly undead?

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Volume 3, Chapter 5.1