Quote Originally Posted by zimmerwald1915 View Post
Celia isn't necessarily expert enough to know the difference between summoning and calling. She's a lawyer and she was a sigil guardian and student before that. Plus she seems to get buy on natural instincts and senses where magic is concerned. She needn't have even one point in Spellcraft. She says her talisman works like a summoning spell when everything we know about it suggests it works more like a calling spell. She sticks around for weeks rather than a few rounds, for instance. Furthermore, the duration of Dorukan's "summoning" of Lirian would be too short for the kind of lovemaking suggested by the rosepetal bed.
Pretty much this. Celia doesn't know the difference (and honestly, the two types have pretty similar effects).

And again, Summon Monster can't be used to get horned devils because they are too powerful. Summon Monster IX can only get the CR 11 barbed devil. Horned devils are CR 16. Now, being a stick figure comic, we don't know for sure that Redcloak's minions here are horned devils, but they fit the description and their most prominent feature is their horns, so I think it's the safest assumption. Add in the timing issues mentioned by others, and we can probably rule out Summon Monster as the method Redcloak used to get these guys.