Trials of the Seven Heroes
An association of all the practitioners of magic in the Eight Worlds. Though not Arborea, really. But the Order claims all eight. The Master leads the Order, and his agents recruit, willingly or not apparently, all those with talent in the worlds. Except Arborea, where a great wizard keeps him out. Maybe. Where all the members of the Order are, exactly, since only a handful are ever seen, is unclear. Perhaps there is a magical sub-world. Perhaps the Master is consuming them all. Perhaps they just stay hidden. It’s hard to say. The Seven Heroes are all titular members of the Order, as is their companion, Donovan, although none of them know anything in particular about it except what they’ve been able to snoop out.