Tips request to beat Maven's Writ

Hi,

I tried but kept failing at the 'boom', which is, I think the 4th attack. And it didn't continue from there but restarted from the beginning again.

Any good tips on beating it, especially it starts from the start after I'm kiled.

I'm level 99 TR pathfinder. About 7m total DPS but kinda weak on physical defense.

Rgds