Nethermancer Sepethrea is the second boss of Tempest Keep: Mechanar dungeon-wing. Once you take the elevator to the second floor, you will have to clear the room first and kill the trash mobs. Be mindful of the robot patrolling. Pull the robot to the corner of the elevator area. Remember that robots call for help.
Tell your team to not step into the next hallway. It starts the last boss event, and you don’t want to do that yet. Once the room is clear, you are ready to fight Nethermancer Sepethrea.
Your tank has to charge Sepethrea. Immediately, she will summon two fire elementals. They are immune to fear. The fire elementals are slow. They will chase two random players. You have to kite them around the room. However, be careful. They leave a trail of fire on the ground. Don’t step on the trail. The second thing you should be mindful of … the two fire elementals will stop chasing and cast hellfire. It is a firewave spam that last approximately 5-8 seconds. Anything caught within the expansion wave will get extreme damage.
That means that tanks have to keep an eye on their back while tanking Nethermancer Sepethrea. Sometimes the fire elementals lose aggro and go back to the tank. If they do hellfire near the tank, basically … game over.
Sepethrea will melee the tank with her huge sword. The casters should place dots (Damage Over Time Spells) on Sepethrea while kiting the Fire Elementals. The healers should place some renews/regrowth/mending on the tank if they are forced to kite around the room. If you are a priest and need to toss a big heal on the tank, while getting chased by one of the fire elementals you must put a shield on yourself first to avoid spell interruption and damage while casting a big heal. Then run away from the fire elemental.
This is another DPS race. Simply burn down Nethermancer Sepethrea. Use Bloodlust near the beginning-middle of the fight. Fire protection potions come handy too—however, I used none as shown in the video. Nethermancer Sepethrea usually knockbacks the tank and she will lose aggro to pick one or two random players. Shield them up. The Tank has to charge her and do anything to grab aggro back. Once she dies, the fire elementals despawn. So don’t waste time fighting them. She shouldn’t last more than 3 minutes. Below you can see a video of the event. She lasted approximately 2:32 minutes.