for infernal summit we need two things:
Good snipers and stoping powers* for demons and bosses
*Scatter, arctica proc, Aries proc, Molt proc
Magic towers, freez the enemeis over the walls and our heroes goes after them... So for better line up and firing power, better to have the enemies more closer than before, also good arrow towers can kill some trouble makers enemies before they start to proc.
Dungeons - Walkthrough: http://cc.forum.igg.com/topic?ctid=231866
CrushCrew guild recruitment (Andrid)
the best guild: CrushCrew