i need help with this as well guys. also F2P. lvl 79, 31K BP. all the reviews I've read here are simply incompetent or you gotta have like 37-38k BP, in which case you're not even gonna need a strategy. you'll be able to beat it with shear power.
Sheer power does not work, I have 37k BP and ran without a strat. You need certain units that cause elemental damage.