Image of Warmage Kaitlyn in the Nexus wants you to use the Interdimensional Refabricator near the rift.
Azeroth's ley lines are being redirected to the Nexus.
The influx of arcane energies is tearing a rift between dimensions.
I cannot stop it, but I've discovered a way to slow it down.
Take this and activate it near the forming rift.