Talk:Overlord Volume 11/@comment-121.54.54.236-20161027013237/@comment-16118869-20161114073419

Ainz does mention in this chapter that he's trying to purposely not use too variety of spells, in case a formidable enemy is collecting information on them. He also tells Shalltear to do the same.

And two of the first spells we see Ainz use after coming to the new world is [Grasp Heart] and [Create Middle Tier Undead: Death Knight], which I assume are his favorites. So it may just be natural for him to use his favorite spells when he's not in need of something specific.