Talk to Chymot, outside the lower entrance of the tower. ( 177, 154, -85 ) Copy/waypoint 177, 154, -85
USE Vizzeren's Arcanum Vision Elixir *before* entering instance to update the quest (which then allows you to see and collect the shards).
Note: You must be on or have completed the Family Ties quest and can get a new elixir from Vizzeren. ( 15, 195, 3 ) Copy/waypoint 15, 195, 3
Find and collect the Nexus Core shards
Collect the shard piece from Izshrash'Khar: Stratum of the Protectors (Shissar Temple), either the Advanced Solo or Heroic, on Sothshae. ( 712, 256, 696 ) Copy/waypoint 711.91, 255.59, 696.15
Note: Shard is behind Imperial Construct at ( -118, 1785, -103 ) Copy/waypoint -117.59, 1784.94, -103.02
Note: it is possible to reach the Shard by just killing the trash on the way up, avoiding all the Named, and be able to reach the shard by standing to the left-rear of Imperial Construct at ( 712, 1784, -99 ) Copy/waypoint 711.91, 1784, -99.
Collect the shard from Ssrez'Ras: Chamber of Stasis (Shissar Temple), either the Advanced Solo or Heroic, on Sothshae.
Note: You can jump down in the pool where Ziskaya stands and click the shard at ( -109, -18, 7 ) Copy/waypoint -109, -18, 7
Complete repairs on The Nexus Core:
Return to Zal'Urid with the shards.
Search for Chymot on Veiled Thessk. ( -900, -50, 18 ) Copy/waypoint -900, -50, 18