I crashed the server in protest of Utterdark!!!!! Heheheh, just kidding.
Not sure what's wrong but I wont be able to check on my computer until I get home - about six hours from now.
Utterdark is definitely only usefull for Ermor and perhaps in select cases for nations with Darkvision like Aby or Agartha. But just because its limited to certain nations doesnt mean its not overpowered. I am still waiting for someone to come up with another level 9 spell which even comes close to Utterdark in power...