In Rockgrove you’ll be dealing with a lot of incoming damage, so it can be a good idea to make use of damage reduction skills providing you with Major and Minor Protection.
Frost Clench is a vital skill for this trial also, you want to maintain this as much as possible on bosses for the Major and Minor Maim, it will allow you to reduce the incoming damage for your entire group.
You’ll need a pull skill for adds on every boss, and Crushing Shock is needed for interrupting ranges adds that do channel attacks.
On last boss Immovable is good for the Main Tank when the boss does it’s channelled swipes allowing you to hit the block mitigation cap to deal with this.
Having a speed boost skill is useful and on the last boss one of the Tanks might be expect to use a group speed boost.
Useful Skills for this Trial:
General skill setup can be found here: