Originally Posted by
Walajanilu
What works there best:
-Throw fire trap when right before walls spawn
-Cast Multishot on Durumu, this will make serpent sting hit 2 pieces of each wall.
-With extra focus, go up each piece of the left and right wall with multidotting using serpent sting, save enough focus for Barrage.
-Position yourself far near the middle spot between two walls to broaden your barrage spread, and cast it.
-After this, focus only on boss; it is worthless to try to keep up dots on walls since Eshams and Demo locks will rape them too fast.