Yeah, a cross-over with Layla's a pretty good idea - she seems to be pretty important to Celestial Mages.
I agree, we've got a support/recovery Spell and a defensive/evasive one so and offensive one'd be good.
The name of the Guild actually comes from
this, but I can't think of a symbol associated to that. I really like Greek mythology so I like the idea of using Artemis. I think a bow and arrow, a stag or the moon (or some combination of the three) would all be cool bases for a logo. I'll start doodling with those in mind. Thank yoooouuuu!! ^_^