Potential Energy Source

We are not the only ones battling the influx of the mana beings. The blood elves, too, are troubled by them, but I'm not sure why.$B$BWhatever they're involved in over there, they don't seem to be stopping. Instead, I've seen them employ a variety of methods to kill the creatures. The most effective involves magical defenses fueled by some sort of concentrated energy.$B$BCapture some of these energy sources and bring them to me. Don't hesitate to stymie the elves if an opportunity presents itself.