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Mortal Shell II

Mortal Shell 2 Lucian Boss Guide: Hidden Keep & Invisible Phase

Find Lucian in the Hidden Keep at Stonebled Gate, follow him into the invisible second phase and defeat him to cleanse the Beacon.

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Contents0107
  1. 01Where is Lucian the Thirsting Knight?
  2. 02How to reach Lucian through the Hidden Keep
  3. 03Lucian first phase: what to watch for
  4. 04Where Lucian goes after the first phase
  5. 05How to survive Lucian's invisible phase
  6. 06What happens after defeating Lucian?
  7. 07Lucian FAQ
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Lucian the Thirsting Knight is the boss tied to the Hidden Keep and cleansing Stonebled Gate Beacon. The route begins at Stonebled Gate, passes through a hidden passage inside the Keep, and ends with a fight that changes after Lucian retreats to higher ground and begins attacking while invisible.

Use Stonebled Gate Beacon as the route anchor.

The associated Beacon dungeon is The Hidden Keep. Enter the cleanse route from Stonebled Gate and progress through the Keep until you reach Lucian.

Defeating him allows the Stonebled Gate progression / cleanse to continue.

How to reach Lucian through the Hidden Keep

Section titled “How to reach Lucian through the Hidden Keep”

Inside the Hidden Keep, continue until you reach a hallway with destructible crates at the end.

Break the crates and look for a highlighted stone.

Interact with the stone to open the hidden passage, then follow the newly opened route to Lucian.

For the site’s broader Beacon coverage, see the Beacons and fast travel guide.

Lucian’s first phase is built around fast sword attacks, including slash and stab combinations.

The main takeaway is to respect the speed of his melee strings rather than treating him like a slow heavy boss.

This guide does not assign frame-perfect punish windows or a required weapon. Use your normal defensive timing and avoid overcommitting into a fast follow-up.

After the first part of the fight, Lucian retreats toward higher ground.

Follow him to continue the encounter.

A supported route uses an opening on the left beside a wall torch, where you squeeze through to reach the next section.

That is the important navigation step if the fight appears to have stopped after the first phase.

In the later phase, Lucian can turn invisible and attack while unseen.

You do not need a special reveal item for the supported route.

A safe current tactic is to use Guard against incoming invisible attacks while paying close attention to your Break meter. Do not let repeated blocked attacks exhaust the meter and leave you open.

Keep the focus on surviving the unseen attacks and taking the next safe opening rather than searching the arena for an invented anti-invisibility mechanic.

Defeating Lucian allows the Stonebled Gate cleanse / progression to continue.

Supported named rewards include:

  • Serpent Stone
  • a Glimpse

This guide does not use an exact Gloom reward because launch guides do not consistently report the same amount.

At the end of the Hidden Keep route tied to Stonebled Gate Beacon.

Stonebled Gate Beacon.

Break the crates at the end of the hallway, then interact with the highlighted stone that opens the hidden route.

Where does Lucian go after the first phase?

Section titled “Where does Lucian go after the first phase?”

He retreats toward higher ground. Follow the opening on the left beside the wall torch to continue the fight.

How do I deal with Lucian while he is invisible?

Section titled “How do I deal with Lucian while he is invisible?”

Use Guard to handle incoming unseen attacks and watch your Break meter so your defense does not collapse.

Supported named rewards include Serpent Stone and a Glimpse.

Does beating Lucian cleanse Stonebled Gate?

Section titled “Does beating Lucian cleanse Stonebled Gate?”

Defeating Lucian allows the Stonebled Gate cleanse / progression to continue.