Board Thread:General Discussion/@comment-26815449-20171002143354/@comment-2804:7F7:E298:4A15:0:0:0:1-20180116140616

I think his "death" gives a great use for his undeads.

If his undeads (Soul Eaters, Death Knights, Elder Liches, etc) start acting strange, like they are struggling to be free to attack everyone around, or if they attack some places, like the Theocracy, everyone will be scared to attack Ainz, because no one will want his undeads causing havoc around. He then returns, saying he came back to life, while his spirit was holding his undeads from attacking his people. It's a decent piece of propaganda.

Demiurge even said something along this lines in the chap 1 of the book 12, just after smashing the wall.