Watching a classic horror movie the other day, a couple of things occurred to me. Firstly, the person calling up the monster had no idea what they were doing; they just believed that what they were doing would work. Secondly, putting the monster down had nothing at all to do with inflicting damage on it; it was more about knowing what had happened to call it up.
Successfully summoning a monster, especially in Orrosh, seems to be a matter of faith rather than technique. Not faith in a religion, regardless of what type, but faith in the superstitions regarding spirits and vengeful ghosts.
With that in mind, I present a number of spells and their associated creatures. They all have one thing in common; whatever they believe they are doing, the person summoning the monster is actually calling up a malicious and malign spirit and binding it to something inanimate.