If you turned left from zone in and killed Atreys first, you can also hop on spirithound there and get to Ghaliga the Ingrate. Then after killing her, backtrack to where you killed Atreys and kill Blackgut the Promised who is standing on top of the gate. The gate opens and quest updates to step 4.
Progress through the zone and kill Ghaliga the Ingrate ( -154, 140, 242 ) Copy/waypoint -154, 140, 242
Cure or you die
Find a way to cross the chasm and enter Vuldor
Progress through the zone and kill Atreys ( -559, 166, 222 ) Copy/waypoint -559, 166, 222
Hop on the spirithound ( -568, 168, 187 ) Copy/waypoint -568, 168, 187
Progress through the zone and kill Blackgut the Promised he is on top of the next gate ( he has a knockback if you don't get out of target ring on the ground)
Delve further into the depths of Vuldor
Kill Blackgut the Rewarded, at the next gate ( 155, 129, -13 ) Copy/waypoint 155, 129, -13 He calls for adds, which come out of a glowing pile on the path behind you, you can click that pile and Banish before more come out.
Reach the Void anchor being constructed in Vuldor. Quest updates down the path at the Spires of Vuldor ( -29, 93, 28 ) Copy/waypoint -29, 93, 28
Lady Najena appears during the fight and helps hold Tarinax back while you are tasked with making sure each magi in several groups of 3 is beaten down into "drained magi" stage. Najena only holds Tarinax for a minute or 2 then needs to rest for a minute before she beacons you to bring Tarinax closer to her again. When all magi are drained Tarinax can be killed.
Exit the zone and Return to Adris
Return to the Port Woe and speak to Liwia Dewdance on the dock ( -76, 6, 349 ) Copy/waypoint -76, 6, 349