Ainz Time Stop and Death 4

He would not give Cure Elim any time to strategize. This was the moment of truth. If he allowed Cure Elim to raise his defense by even a little, or if [Tribute to the Black Bounty – Iä Shub-Niggurath] was disrupted, then it would spell defeat for Suzuki Satoru.
Certainly, he could have cast [Time Stop]. However, [Time Stop] had been ineffective against the Brightness Dragon Lord which he had fought before, which meant that it was very likely that it would also be useless against the Dragon Lord Cure Elim’s original body. However, it ought to be effective against the Zombies surrounding Cure Elim. If those Zombies had the same defensive strength as Cure Elim, then his first round of attack spells would have been ineffective, and he would not have been able to defeat so many Zombies.

- Overlord; Bonus Volume; Chapter 4