Buffs
Try to get your ultimate to a full 500 charge so you can make the most out of the trial and monster set you have on. Make sure you reapply your abilities upon running out, this will make fights go a lot faster or a lot smoother. Combat Prayer gives Minor Berserk (increases damage done) to the group so make sure you use it a lot. Agony Totem grants a debuff Minor Vulnerability (increases enemy damage taken), and apply Minor Protection (reduces damage taken) to the group standing in the effect.
Rotation
Backup Bar: Spirit Guardian -> Braided Tether -> Elemental Blockade. Reapply once expired
Main Bar: Radiating Regeneration -> Illustrious Healing -> Combat Prayer -> Agony Totem.
You’ll use Necrotic Potency whenever there are corpses on the floor with a blue glow coming from them and you don’t need to use the corpse for another ability.
Renewing Undeath removes any negative effects, but requires a corpse to cast. Make sure you use it when a lot of negative effects are on your group.
Energy Orb is to be used on anyone who asks for resources.
Notes
Make sure you announce that you’re using Aggressive Horn, as this is a Major buff for all your group members.
Make sure you use your Renewing Animation Ultimate on a maximum of 3 of your fallen group members, to get full use of it. Don’t waste it on just a single group member unless the main tank has fallen.