TheWoWDBJust found him right on top of A Found Memento, around 53.35, 80.64 on Broken Shore.
Rare Elite
Aqueux
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Anyone know spawn time? or is a world quest?
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
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Aqueux can be found off of the southeast coast of the Broken Shore in an area known as the Forlorn Depths. You will need to swim a little ways out before you can fight this enemy.
Level and Map Tracking
The game data tunes Aqueux for level 45, Legion content.
The map marks it with vignette 1,907, which the client hides once hidden tracking quest 46953 is complete. In game, /run print(C_QuestLog.IsQuestFlaggedCompleted(46953)) prints true when that quest is flagged for your character.