My suggestion is:
Firelord (fire mage) int based
Offensive skill:
Fireball, that deals 35dmg (lvl 10 = 350)
While used on Vampire, can set on him burn status, that take no dmg, but... (look ulti)
Deffensive skill:
(no name yet), change the Firelord into flame*?, that gives him evasion 7,5% per lvl (lvl 10 = 75%). That spells duration is always
10sec, just chance for evasion grow.
Blink, stats
Ultimate skill:
Firebomb, AoE(400/500range?) that deal 10% HP, to Vampires. Also put burn status on Vampires that deals 1% Hp each second for 10 seconds. Used with fireball can make him burn longer, for another 10sec.