Are you kidding me ? Grimgore Adamantiumside

I hate playing games with bossfights and here is my personal boss who dismantle two armies single handed. With 200 armor I really don't know how to handle this guy (lvl 40), I throw everything on him once he is in range, melee heros, debuff, anti armor, armor penetration and he just walks by and I slowly dispatch my two armies (ignoring the giants and mobs surrounding him for now).

I've a IE campaign and this guy is unstoppable. Is there any cheat or 'balance' patch to keep LL like this in check ?