If your recruitment thread involves completely going off site with your partner(s) then it belongs in the Off-Site Ad Area.
This area of the site is governed by the official Recruitment rules. Whether you are looking for players or looking for a roleplay, we recommend you read them and familiarize your self with them. Read the Recruitment Rules Here.
Creatures/Races there's no limitation.
As for powers, any sort of "OP" or "Godly" type of magic is absolutely forbidden unless it's in a very small way. Time and Space manipulation, erasing things from existence, that sort of stuff. For example, you can have Spatial type of magic to have your own pocket dimension where you'd store items and such but that's about it when it comes to that sort of magic. Teleportation should also be somewhat limited.. for example only being able to teleport to places in your range of sight or something. These are just some examples..
I'll send you an invite!