Diana needs a buff

She's decent now just need some small changes to make her better and define her more.

She fits well as a Bruiser Mage that can solo lane and jungle.

Her mana costs are outrageous and she's just not tanky enough to be a full on initiatior without dying almost instantly.

I say maybe lower her mana costs slightly to compensate for the horrific mana regen we have now and maybe add a passive to her or E to give her boosted armor and MR maybe permanently (similar to Ori) or a boost for a short time after activation. If this is added I wouldn't even mind the insanely high cool down it currently has

Any other suggestions guys?