I think you have not learnt any Master skill yet... Because mages don't need a buff. Spells like Earthquake, Meteor Shower, Blizzard, are overpowered. MS and Blizz can kill almost anything and wipe foes in a large area, and EQ can knock down the whole battlefield and do massive damage. And there are more than these.
Mages are weak at the beginning because they lack Intelligence, but once you get high intel they do good damage even with their basic spells, and they can freeze, stun, etc. Oh, and they can heal and dispel.
