Librarian Serrah in the Transitus Shield needs you to kill Arcane Serpents near the Nexus and collect 5 Nexus Mana Essences from them.
Our existence here depends entirely upon staying hidden. Should the shield fail, even for a moment, Malygos' minions would have us.
One of my responsibilities is to rejuvenate the warmages' mana levels so their focus doesn't falter. With our supply lines lost, I've been forced to improvise.
I could use your help, <name>.
Very near the Nexus, Arcane Serpents feast on the abundant magical energies. Once defeated, they will yield a mana essence that I can make use of.