You wont have to level anything else up as stated before, you can probably expect cross role skills like sure/swiftcast and probably raging strikes, of course these are just my opinion, considering they get some buff or mechanic called chainspell for the ranged magic role itll play as, Ive got noidea what possible cross role skills it will have. Seems like maybe e4e or virus, but to the roots of a dps, it wouldnt make sense. For rdm it sort of would