Essential Skills for this Trial:
There are no greatly useful skills in this trial other than the standard skills. An interrupt skill like deep breath is great for add pulls as you can sometimes have 4 of them all channelling an interruptible enrage at the same time.
On the last boss using damage reduction on the boss such as Revealing Flare for Major Protection combined with Frost Clench for Major/Minor Maim will help to reduce the incoming damage.
Off Tanks can make use of Mystic Guard to help the Main Tank survive since this trial has a ton of damage.
General skill setup can be found here: