Use the Unstable Warp Rift Generator in the Warp Fields. Gather 3 Warp Nethers from Unstable Voidwalkers and return them to Ogath the Mad in Spinebreaker Post.
Long have I wandered through Outland, searching for the truth of the void. Now I am old and weak. Perhaps you will help me?
I must learn the secrets of the voidwalkers. You must find the Warp Fields to the west. West of the Expedition Armory there is a dark place on the edge of the abyss where time and space are weak. Use my unstable warp rift generator in the Warp Fields to create a warp rift. You must gather warp nether from the creatures that come through.