Carl's long-term Emberus quest requires identifying Geyrun's killer through Orthrus, Apito's impossible memorial crystal, Katia's crossbow, and Donut's oak bracelet.
Geyrun, Emberus's son, was murdered before Orthrus escaped the Nothing. Emberus searched the two-headed dog's mind, but its memory became unreliable during imprisonment.
Hellik remains the leading suspect despite an apparent alibi. A separate quest requires Carl to kill Hellik before floor twelve, possibly regardless of whether the murder accusation proves true.
Pater Coal says Apito's memorial crystal is mandatory for progress. Such crystals form only when gods die, yet Apito supposedly still lives, creating the central contradiction.
Once the crystal is obtained from another crawler, two paths open: investigate the origin of Katia's inherited crossbow or the origin of Donut's oak bracelet. The dungeon AI emphasizes both through Coal.
A divine murder board connecting a two-headed dog, memorial crystal, crossbow, oak bracelet, and rival god.
The investigation is Carl's pre-exit divine mystery and the narrative tying several old loot items together.