The final boss is an absurd difficulty spike once you get past the initial grind, basically requiring max HP and regen, as well as being basically impossible with a dagger. A staff's range or a sword's knockback can keep you away from his attack before he teleports, but there is no solution for daggers besides hoping your face stays intact.
The game as a whole is very fun, though.
Ahh... so many teams claim to be unbeatable, only to be stripped clean my the most clumsily gathered teams. It's hard finding a good team though. I feel pathetic right now anyways. I just got beaten by my own team.