I failed this one few times aswell, but as you keep failing you start to understand it and learn from it and beat it.

- At first when its you and Arenvald, try to stay away from his side, grab the aeatherballs on your side and if you notice that one slips past him, run and AoE it.
- The second part is the one where people fail, after you break free from her bind, AoE as many, always protect those that do not have the Echo first. This part is a game of anticipation and reaction.
- When one of the character cast a shield, stay in it.
- Just remember to let the NPC AoE their side of the field while you do yours, but beware the NPC have slow reaction, so always keep an eye on them.

Untill SE nerfs or changes this fight, the only thing that you can do is do your best, learn and repeat if you fail the fight.

Good luck