NO Cavas

Hi!

Cavas does not appear if your level is too far above or below the area level you are playing in. Going somewhere more appropriate for your character should get him to spawn again and allow you to complete and resolve your quests. You shouldn't be able to outlevel Blood Aqueducts or later in this way.

Optionally, they should resolve on their own if you proceed past the Synthesis Templar Laboratory encounter while mapping.

Please let me know if your quests are still stuck following this.

Hi!

You should be able to travel to the Memory Nexus via Waypoint, it'll be the topmost icon above Hideout/Menagerie/Aspirant's Plaza/Azurite Mine. The icon appears as soon as you've completed a Fractured memory at or after The Ledge in Act 1.

Talk to Cavas after completing another Fractured Memory, that should set everything required to unlock the Nexus. It seems talking to him without doing or successfully completing the memory won't open up the Nexus for you.

Will you try this again, and then let me know if you're still having issues?