Help me kill Karador plz

[XiombargDei]

Hi all

so this is my setup :


I tried everything possible but i just cant kill him
as soon as i kill a stack, of skeleton warriors for example, he raises it, i dont have time to put one of my unit on top of it
i dont have access to necromancers anywhere, nor druids or ancient ents
I cant nuke 60 necros in the first round, best i can is ~40

i'm a combat mage lvl25, my leadership is 12700, INT 21 ATT 9 DEF 12
i dont have any of the anti-undead items like the silver sword for example
i have fire rain III, armageddon III, Ice snake III and other goodies like magic shackles etc.

so how would you do it ? what unit setup ? what battle strategy ?
i really need help

thanks