Farming can get boring. the various objective keep things fresh & keep one having to find new ways of using & placing crusaders....how about a set based not on formation, but on original 20 crusaders(kinda like the lion king objective is Artaxes based) ..maybe about 5 per crusader...amount of ep = lock/unlock
for example:
~each could have a solo run
~panda could have 'gps' (gold per second) objectives, where the enemies lose health at rate player gains gold (dps would be meaningless)...several size/shape formation & area depths could = 5 different objectives
~Thalia could have tank objectives