Mortal Shell 2: Get Endless Core & Lift Upgrade Cap

To get the Endless Core in Mortal Shell 2 and lift the upgrade cap, you must defeat the secret boss, the Hollowed Pilgrim, in the Sunken Cathedral after collecting all three Shattered Sigils, then use the core at the Altar of Echoes to unlock the final tier of weapon and shell upgrades. This guide explains the exact steps, what the cap increase actually changes, and common pitfalls that block the fight from appearing.

Background: What the Upgrade Cap Is

In Mortal Shell 2, every weapon and shell has a base upgrade level that increases damage, stamina efficiency, or resistance. The standard cap is +5 for weapons and +3 for shells. The Endless Core is a unique key item that removes this ceiling, allowing you to push weapons to +8 and shells to +5. This is the only way to reach the maximum stats in a single playthrough, making it essential for players attempting the highest difficulty or the New Game+ cycle.

Prerequisites: The Three Shattered Sigils

Before the Pilgrim appears, you must collect all three Shattered Sigils. These are hidden in the three main regions, each tied to a specific boss or puzzle:

• Sigil of Ash – Found in the Scorched Mire, inside the collapsed bell tower after defeating the Ember Warden. Look for a hidden wall behind the boss arena.
• Sigil of Frost – Located in the Glacial Hollow, in a frozen cave guarded by two Frost Knights. The sigil is on a pedestal that only appears after you light all four braziers in the cave.
• Sigil of Storm – In the Tempest Coast, at the top of the lighthouse. You must solve the rotating mirror puzzle to focus a beam of light onto the sigil, which then becomes interactable.

You do not need to carry the sigils in your inventory; they are automatically stored in your key items menu once picked up.

How to Unlock the Hollowed Pilgrim Fight

Once you have all three sigils, travel to the Sunken Cathedral, the central hub area. Go to the large circular chamber with the broken stained-glass window (the same room where you first met the Old Prisoner). Equip the sigils in your quick slots (they are not automatically used). Stand on the central seal and use each sigil in order: Ash, Frost, Storm. A short cutscene plays, and the Hollowed Pilgrim spawns.

The Pilgrim is a fast, two-phase boss. In phase one, it uses a scythe and teleports. In phase two, it summons spectral copies that attack in a pattern. The key is to parry its lunging attack, which staggers it and leaves it open for a critical hit. After defeating it, the Pilgrim drops the Endless Core.

Using the Endless Core: Lift the Cap

With the core in hand, go to the Altar of Echoes, located in the same hub area, just past the Old Prisoner’s cell. Interact with the altar and select “Offer Endless Core.” This permanently raises the upgrade limit for all weapons and shells on your current save file. There is no cost in Tar or Glimpses—the core itself is the only requirement.

After offering the core, visit any blacksmith (the one in the hub or the traveling one in each region). You will now see additional upgrade tiers available. Each new tier costs more Tar and Glimpses than the previous ones, and requires a specific rare material: Chisel of the Ancients for weapons, and Veil of the Forgotten for shells. These materials are found in hidden chests in each region, usually in areas that require the grappling hook upgrade.

Common Problems and How to Fix Them

Many players report that the Pilgrim does not spawn even with all three sigils. Here are the most common causes:

• Sigils not equipped: You must have the sigils in your quick slots, not just in your inventory. Open the pause menu, go to Key Items, and assign each sigil to a quick slot.
• Wrong order: The order is fixed: Ash, Frost, Storm. Using them in any other order does nothing and may waste the sigil’s use for that attempt (they recharge after resting at a checkpoint).
• Boss already defeated: If you somehow killed the Pilgrim earlier (this is possible if you had the sigils from a previous playthrough), the core will already be in your inventory. Check your key items.
• Glitch after patch: Some players on older versions of the game experienced a bug where the seal did not activate. Update the game to the latest patch, which fixes this.

What the Cap Increase Actually Changes

Lifting the cap does not just add raw damage numbers. Each weapon tier beyond +5 adds a new passive effect. For example, the starting sword (the Hollowed Blade) at +7 gains a lifesteal on critical hits, and at +8 it gains a chance to stagger on heavy attacks. Similarly, shells at +4 gain a bonus to stamina recovery, and at +5 they gain a unique skill point that can be spent in their skill tree.

This means the Endless Core is not just a stat boost; it changes your build options. Players who want to maximize a specific playstyle (e.g., a parry-focused build) will find the new passives essential for higher difficulties.

Alternatives and New Game Plus

If you miss the Endless Core in your first playthrough, you can still get it in New Game Plus. The sigils carry over, and the Pilgrim fight is available again. However, the boss scales with your level, so it is tougher. There is no other way to lift the cap—no NPC sells the core, and it is not a random drop. The only alternative is to start a new game and collect the sigils again, which is faster if you know the locations.

Frequently Asked Questions

Can I get the Endless Core before defeating the final boss?

Yes, you can collect all three sigils and defeat the Pilgrim before the final boss. The Pilgrim is optional, and the fight is balanced for mid-to-late game. It is recommended to have at least one weapon at +4 and a shell at +2 before attempting it.

Do I need to offer the core on every character?

Yes, the Endless Core is a per-save item. If you start a new character, you must collect the sigils and defeat the Pilgrim again. However, in New Game Plus, the core carries over if you already offered it in the previous cycle.

What happens if I use the sigils in the wrong order?

Nothing happens—the seal simply does not activate. The sigils are not consumed, but they go on a short cooldown (about 30 seconds). Rest at a checkpoint to reset them if needed.

Is the Endless Core required for the platinum trophy?

Yes, the trophy “Endless” requires you to lift the upgrade cap. It is one of the few missable trophies, so make sure to do it before the final boss if you want the platinum in one playthrough.

Can I sell the Endless Core?

No, the core is a key item and cannot be sold or dropped. Once you have it, you can only offer it to the altar or carry it into New Game Plus.

Related

• FF7 Rebirth Beginner Tips: Combat, Party, Exploration
• Ecommerce Observability Metrics & Alerts to Prevent Outages
• How to Read Auth Logs and Spot SSH Break-In Attempts