A Skull inhabited with the spirit of Mithra.

Cavelli, still apparently oblivious to the voice, begins to muse. “I’ve heard the skull you seek can speak to the minds of certain adepts, but Mithra cannot always be trusted. - Backstory codex - Hunter (RPA-BC)

The Ossuary is where you run into Cavelli again looking for the skull of Mithra. A voice in your head tells you to lose Cavelli.

• Tell Cavelli of the skull and what it told you to do.
• Chase off Cavelli and listen to what the skull has to say.

In Kulbak Prison the Skull speaks to you again, telling you to find a map inside a Construct.

• Do you tear into the Construct to find the map
• Ask nicely for the map from the Construct.

You find the Gravestone with the strange markings you remember that your father taught you. Inside you find a solid green orb. Cavelli shows up with several other figures from the Starlit door

• Attack Cavelli by throwing the skull of Mithra at him.
• Convince them you will use the orb to help the Starlit Door