Quicken and Empower SLA (magic missile), Combat Expertise? I see them throwing magic missles around like mad. I could drop one of the magic missle feats or the other if there's strong sentiment against them, but I'd like to keep at least one.
Skills: 14 at 13 ranks
Concentration, Diplomacy, Gather Information, Knowledge (arcana), Knowledge (the planes), Listen, Search, Spellcraft, Spot? 3 more Knowledge skills?
Empower (searing light) works for me.
Decipher Script would seem to make sense in their pursuit of Knowledge. And maybe Sense Motive to support their approach to "equal value" of shared knowledge?
Updated.
Suggested sample weapon for attack lines? Quarterstaff?
Organization: Solitary or x (2-8)
Challenge Rating: 7? They are fare less deadly than the equal HD, CR 9 vrock and osyluth.
Treasure: No coins; standard goods; no items?
Alignment: Always neutral good?
Advancement: 11-20 HD (Medium); 21-30 HD (Large)?