Lucanis Drumt in "Dragon Age: Shadowkeep" is a very useful and powerful teammate in the game. If you want to recruit Lucanis Dramt, you can do it in the main mission "Sea of Blood". Recruiting him in Treviso, after meeting with the Antivan Crow, you make a deal with them to rescue Lucanis in exchange for his help.
How to recruit Lucanis Drumt into the team in Dragon Age 4
If you're eager to add Antivan the Crow and the mage-slayer Lucanis Drumt to your side, you can recruit him in the main quest "Sea of Blood" in Dragon Age: Shadowkeep . After meeting with the Antivan Crow in Treviso, you make a deal with them to rescue Lucanis in exchange for his help.
Lucanis, also known as the Demon of Valantium, was unfortunately captured by hunters. In Sea of Blood, you must delve into the Hunter's underwater prison, the Ossuary.
Lucanis will join your party immediately after you free him from his cell. Before returning to the lighthouse, though, you'll need to help him complete a few tasks, including destroying a vial of his blood and defeating Kalivan.
After recruiting Lucanis, he will move to a room in the restaurant building inside the lighthouse.