To unlock the Forsaken Tower in Metaphor: ReFantazio, you need to follow these steps:

1. Accept the Quest:
– You must accept the quest called “Superior Scrimshaw” which is given by a craftsman in the Merchant’s Bazaar in Brilehaven.

2. Purchase Information:
– If you haven’t already, speak with the Seasoned Man in the Greatest Catch Tavern and purchase the “Fiend of the Forsaken Tower” information for 1,800 Reeve. This will allow you to travel to the tower via your Gauntlet Runner.

3. Travel to the Tower:
– After purchasing the information, use your Gauntlet Runner to travel to the Forsaken Tower. This journey takes three days and includes various challenges from rival Gauntlet Runners and a stop at Gracia Forest, where you can complete the Soldier’s Solace quest given by the Exhausted Woman in Angler’s Inn Square.

4. Prepare for Combat:
– Stock up on recovery items like Panacea or Invigorating Steam Bun to help combat status effects inflicted by some enemies during battles. This is crucial because mobs like the Trove Imitec can inflict Sleep status on party members.

5. Explore and Defeat Enemies:
– Once you reach the Forsaken Tower, proceed through its seven floors, defeating various enemies along the way. The first three floors are action-packed, with encounters involving Goborns, Potolpos, and other challenging enemies.

6. Reach the Boss:
– On the seventh floor, you will encounter Orgas, a challenging boss. To stand a fighting chance against it, use the Healer, Thief, and Faker archetypes. Defeat Orgas and retrieve the Ebony Horn.

7. Return to Brilehaven:
– After defeating Orgas and obtaining the Ebony Horn, return to Brilehaven and turn in the craftsman’s request the next day. This will complete the Superior Scrimshaw quest and unlock further dialogue options for other quests.

8. Retrieve the Deed (Optional):
– If you need to retrieve a Deed from an ishkia noble as part of another quest, you will need to have already completed the Superior Scrimshaw quest and defeated Orgas. Use the correct dialogue options to guide the conversation toward the Deed, and then return it to the Overfamiliar Man to complete the quest.

By following these steps, you will be able to unlock and explore the Forsaken Tower in Metaphor: ReFantazio.