Just helped a friend with the WB Welenkin Cove in Summerset and B'Korgan seems bugged. I know the orbs have to all be down for the boss' shield to drop, but orbs never seemed to stop spawning, a group of 10 could barely keep up with the orbs. Maybe B'Korgan needs to spawn less orbs with fewer players? I've never seen so many, and it took the group almost 10 minutes to kill him, because he was only un-shielded for a few seconds at a time. The adds were almost always, group couldn't kill them, all the orbs, AND hit the boss.
Most World Bosses can be finished with 4 CP 810 players;when a group with 10, 6 of whom are 810, has issues the boss needs to be reworked.