Go to the North Wing Stacks on the first floor of the Library, then take the teleporter at ( 260, -20, -285 ) /waypoint 260, -20, -285 to the Elemental Portal Gallery. Use the portal at ( 712, 412, -380 ) /waypoint 712, 412, -380 to enter.
Periodically during the fight, the mob will emote in blue "Bzzkill is about to call for reinforcements". He must be interrupted. WAIT for the cast bar for Stormrider's Call and then interrupt him. If you cast your interrupt at the emote and don't wait for the cast bar, your interrupt can go off too soon. If you fail to interrupt, he summons a set of 6 adds.
Bzzkill has a buff called Honey Infusion that, among other things, reduces all damage he takes by 25%. If you're a class with a dispel, use it.
Go right and around to kill Aurorax at ( -555, 648, -172 ) /waypoint -555, 648, -172.
Kill the hive queensguard elite. They are all rooted on a separate honey cell. The honey cell goes away shortly after the guard is killed, so move off it quickly.
When all the guards are dead, move to the center to engage Aurorax. This avoids the honey explosions that rise from the (new) holes where the guards used to be during the fight.
Loot an ephermal gust. You will be teleported to ( -543, -169, -9076 ) /waypoint -543, -169, -9076.