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My favorite Templar method. Once you got rid of all the oracles and the relic shows up, kill yourselves so that you can respawn. Then, one high-leveled player grabs the relic while everyone else stays up on the ledge. Equip some sniper rifles. This tactic is good because you get an omnipotent view on the oracles, and you can shoot the templar. Note that if the relic holder dies or if you miss an oracle, you're screwed.