Scarlett should go to the Administration Center of the Arsenal District and speak with the administrator, Largo, in his office. He will ask for a favor in return, the Secret Errands quest. Once Scarlett has the key to the Old Chimney, she needs to go there.
This quest is mandatory. Scarlett needs to completed as part of her primary objective.
- The Voice of the Dead - Scarlett must speak with the ghost of Liora's dead husband to earn a letter of recommendation to Largo.
- Secret Errands - Scarlett must deal with Largo to get the key to the Old Chimney.
From the upper Platform landing, she should go around or under the final flight of stairs leading to the Skullbreak Tavern, then head north across an arching bridge (dealing with the Flying Beasts that hover above the bridge.) The door to the Old Chimney is in the roof and leads to a steep, narrow stairway leading down. If [[Scarlett] has the key, the door opens easily. (Click on the map to enlarge it.)
Inside the Old Chimney, Scarlett will find still more Flying Beasts hovering around the top of the Chimney. After dealing with those, she should find Sophistos's body lying around the balcony at the top level of the Chimney. She should speak with the old necromancer, using The Passage to invoke The Whisper necromantic skill. Sophistos will have long story to tell her, and will not suffer interruptions. Just let him ramble on, and he will eventually reveal where he buried the Black Grimoire, and even give her a map.
Scarlett should also pick up a scroll line beside Sophistos's body. It will place the "machinery instructions" in her Journal, which is the valve sequence for starting the furnace that she will eventually need to destroy the Black Grimoire.
- Secret Errands - (prerequisite) Do a favor for Largo in exchange for a key to the Old Chimney.
- Chasing the Black Grimoire - (successor) we covered the Black Grimoire from where Sophistos buried it.
- The Undead Archon - Scarlett's over-arching quest leads her to the Old Chimney.
|Note: On the PlayStation 3 version of Venetica, at least, "The Dark Tower" quest never actually appears on Scarlett's Active Quests list; it only appears in her Completed Quests list when she finishes it.
Perhaps there's a variant gameplay sequence that reveals the quest explicity, but I haven't found it.