How to deal with Gremlion ?

[jake21]

So I think this is the last min-boss i have and while I can kill it (with huge losses) I've not figured out how to do it elegantly (I'm a mage around level 45). The thing is that the area attack kills huge amount and it seems to retaliate so I want to use things like assassins; also it appears to be vulnerable to fire but the ony thing that comes to mind are archers.

So maybe royal snakes, assassins, archers, paladins (for resurrection and the tower) and ??