Complete the following in the Ruins of Verelisk ( 1919, 39, 267 ) Copy/waypoint 1918.52, 39.42, 267.43. The Meta-Siphon can only work after they have been reduced to 25% or less health:
You must use the Meta-Siphon when the target is at or below 25% health. This makes this an interesting quest when the smallest damage you can do is more than their health... High level players just swap out a couple spells for some low level ones.