As it says, I just did the world boss following reset, and it was an absolute lagfest, but we killed it - oddly enough the UI said “The Main Event failed” after the boss died.
But then the completion dialogue played where the goblin says “Aw man you totally wrecked it! etc” and I received 45 Valorstones but no warbound item and from raid chat, not many other people won items either. I was not AFK, and did as much dps as possible despite the server issues with this boss.
I was under the impression this boss was supposed to drop a guaranteed random warbound item each week, and because the quest completed (despite saying it failed, for whatever reason), I can’t get an item on alts.
Edit: shortly after I posted this I received a pair of mail legs in the mail, so I’m guessing the server sorted itself out- feel free to lock/delete this.