Defend Pact Engineers...
I hate this event. At first i couldn’t do it with my thief and just thought well it’s my thief. Then when my warrior couldn’t do it i knew it was bullkitten for a solo event.
I think it is designed for a group. Probably 5, when it would be ridiculously easy. Doing it solo is hard, but possible. The trick is to down the trebs asap as their knockbacks make the spawns from the rotmouths lethal. Taking out the rotmouths next, to slow the spawns, should be your next goal. After that when ever you have time res up an engineer to near full, but not all the way because he will really quickly without help. Once you have done this (may require you to run away a few times) with all four engineers, take out the trebs, take out the rotmouths and res all four engineers so that they are up at the same time. Once they are all up together, only takes about a minute for the event to finish.