Mol
Legend
I had done no prior quest and was flown out to this spot on a second account and the event spawned shortly after being there, but then it didn't spawn for another 3-4 hoursof watching the spawn point. Maybe the quest helps prompt the event?
Update: When you finish all Phases and kill the Towers quickly, the last vendor also spawns and then they stay 5min. It appears that the attacks start each 2 hours. Before it was 22:00 now its was like 00:00 +/-
The second Vendor gives 2 Gems BOE for 160 Shards to fit in a Meta Slot:
12 Crit / 5% Stun Reduction - the other one was 3 Int / 5 Stun Reduction
And they dont say unique equipped like the others.... so im wondering... x)