Thing is the templar fight isn't even that difficult. I just find it humorous the amount of misinformation around - to the extent that somebody was under the impression the only way to kill him was to cheese him off the edge and the chest was specifically a reward for doing so !
You gain the chest legitimately by blocking his teleport. This in turn prevents his shield for returning and allows you all to pile on the damage. The only downside is that minotaurs start spawning but that just means you have to work as a team. Dedicate two to minotaur bashing duty (one of them the relic holder) and let the other 4 pile rockets / ice breaker into him.
You gain the chest legitimately by blocking his teleport. This in turn prevents his shield for returning and allows you all to pile on the damage. The only downside is that minotaurs start spawning but that just means you have to work as a team. Dedicate two to minotaur bashing duty (one of them the relic holder) and let the other 4 pile rockets / ice breaker into him.