Quote Originally Posted by Gift Jeraff View Post
It's "only" a sixth-level spell and it's also available to wizards and sorcerers. It's not hard to imagine that after 35 years of adventuring+conquering lands he got his hands on a few scrolls of Create Undead. And since he's not totally against the idea, he saved them just in case.

There could also be an 11th-level cleric in Malack's church who has no problem creating undead, but I feel that's less plausible.
The scroll would have to be caster level 15 in order to create mummies.

I'm not assuming that Malack didn't just make his own scrolls. However, since he would have to be level 15 in order to create the scrolls anyway, it doesn't matter whether he used scrolls he crafted or cast the spell directly.