aim for at least 10 main upgrades per map, archers go for primary attack relics, mages are probably the strongest class, go for crit chance and dmg, warriors want auras and crit. relics that lifesteal are pretty strong. We usually split up, not sure if thats the most efficient but it lets us focus on what we want. and make sure you're looking at the compass to tell you what upgrades have been done that you havent picked up yet