It must say "Orison". It must be able to be printed on whatever we want, whether its paper, a t-shirt, a poster, a sticker, etc.
Obviously, we are a hard rock band, so something grittier and darker might be better. But just do what you think is right.
It would be cool, but not necessary, to have the O be defining of the logo. Kind of like Opeth's logo. Not necessarily as intricate or flowery, but you get the idea.
If we pick your logo, we'll give you due credit and will undoubtedly come back to you for future work.