MQ rescue of Vatendeth @Plastida help!

Hi. I'm stucked with the Boss of the main quest rescue of Vatendeth @Plastida (think it's called Imitator). Tried with mercenaries and boosts but no way, not even close.

I'm a warrior lv92. Don't know if it's too soon for that quest, but do you have any advice for that boss??? I should try to hit only the main boss, or first clear the normal mobs in front of him??

Tx.

 

Play it on easy.

If you don't want to then don't go near the tentacles, ignore them and focus on the boss. Stay on the furthermost middle area(sorry dunno what to call it) where the guy is imprisoned.

 

Attack once with merc and dont attack anymore use pots to recover dont fight back thats important

 

Will try this. Tx!