Dorvias is tethered to the room and is immune to slow.
Throughout the fight, Dorvias will spawn adds at different locations in the zone and begins to channel a power-up.
If you damage Dorvias while adds are up, then he will increase in power.
You can interrupt the power-up by killing the adds quickly. You can either place the raid at different locations in the zone and engage the adds, or find them with an off tank and dps with pets. When adds are dead, you may resume dps on Dorvias. Locations: Both hallways by Maestro, in Maestro's room, in hallway near Vasella, on the ramp going down from Dorvias.
