I just cleaned Montero's lair is 1 stack of Knights (86 of them) in no-loss. I have 2 Dragon shields so 70% fire resistance and 30% base resistance for my Knights. I use basically 2 spells on top of that: guarding angel (or whatever it is called) and resurrection, with Mana accelerator only from my Dragon. Traps and mana rings are also great there.
