When casting Spells the Broker Raid Boss sometimes says “Gaze into the Warp!”
Furthermore his Warp-aligned Magic Bolt is called Hyperlight Spark which deals Arcane Damage not Holy Damage despite the name. The associations between Arcane and Radiance/Brightness(seen with Azshara and Isiset) not from the Sun, Naaru or Gold are getting bigger!
At this rate I wouldn’t be surprised if Light from a Lightbulb did Arcane Damage rather than Holy Damage! The Light seems to originate only from Sunlight, the Crystals of the Light and Gold(Gold infact deals Holy Damage) it seems!
I would assume the Warp is the Arcane counterpart to the Fel’s Twisting Nether.