For event information, see this quest entry.
The three clockworks in the room must be killed. They will be activated one at a time (random order) - one after the death of the previous:
Spawning throughout the entire encounter are a mechanical contraption which AE a low-resist stun if not disarmed in time.
Nurtha appears again after the clockworks are killed. She is at 3% health and will attempt to flee. Kill her to complete the event.
Arachnid Model XII's Protective Hull
Box of Everburning Flame
Essence of Speed
Glowing Obsidian Rune
Gnomework Model XVII's Experimental Chestguard
Gnomework Model XVII's Experimental Plate Backing
Nurtha's Leggings of Focus
Nurtha's Shoulderpads of Concentration
Vermin Model IV's Diseased Bauble
Vermin Model IV's Diseased Harness