City of Arabel boasts many summoning themes.

- Animals
- Vermin/bugs
- Evil planar creatures
- Good planar creatures
- Undead
- Slaadi
- Dragons (good/evil)
- Demons
- Warriors (summoned weapons)
- Fey (elves faries and whatnot)
- Constructs
- Magic creatures/elementals
- Ooze (custom or part of vermin theme?)
- Reptiles/crocodiles (Custom?)
- Shadows (Rift magic)

You may use the PC Mode switch tool on regeants to change these themes for a single spell at the cost of the regeant. Or target a summoning book for a more permanent solution. Not mentioning which regeant does what since discovery is half the fun!