Quote Originally Posted by Fish View Post
Smart money is that he has already cast it: Monster Summoning IX can summon extraplanar beings such as demons.
The Summon Monster spells have a duration measured in rounds. Even at Redcloak's level, Summon Monster IX would last less than 2 minutes. I sincerely doubt the demons he has with him were brought in that way. The more likely options are the Planar Ally line of spells or Gate.

Zevox