Mortal Shell Crucix Boss Guide

Mortal Shell boss guide: Crucix the Twiceborn

It's like King Leonidas and Ephialtes did a fusion dance

Crucix the Twiceborn is the boss at the end of Mortal Shell‘s Seat of Infinity zone. Here’s our guide on how to beat him.

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Note: For more information, check out our Mortal Shell guides and features hub.

Mortal Shell Crucix Boss Guide 1a

Mortal Shell: Crucix the Twiceborn boss guide

You can follow our exploration guide to know how to reach the Seat of Infinity zone via one of the exits in Fallgrim. Additionally, our Hammer and Chisel guide tells you how to get the weapon, its upgrades/skills, as well as the Solemn Offering material in the area.

Mortal Shell Crucix Boss Guide 1b

In any case, once you reach the Shifting Archives, speak with Sester Genessa to activate that savepoint. Then, interact with the chalice to drop down to Crucix the Twiceborn’s arena.

Note: You need to harden when you fall down or you’ll lose your “second chance/extra life.”

Mortal Shell Crucix Boss Guide 1c

Phase 1

Crucix the Twiceborn looks like a Spartan warrior, and he’s got a twin growing on him too.

Mortal Shell Crucix Boss Guide 2a

This boss’ attacks include a multi-hit combo that can be easily avoided or negated via hardening. I find that it’s easy to take swipes at him once he’s done with his combo. Likewise, if you can land four consecutive hits, you can stun him for a few seconds.

Mortal Shell Crucix Boss Guide 2b

However, if you’re further away, Crucix will hunker down and the tiny twin will shoot you with flaming arrows.

Mortal Shell Crucix Boss Guide 2c

Once you lower his health to 50%, Crucix will then use a special attack where he dive-bombs you from the air. This attack will outright kill you especially if you’ve got low health or you’re using Tiel the Acolyte’s shell. Use your harden ability to negate this devastating blow.

Mortal Shell Crucix Boss Guide 2d

Phase 2

After dropping his health to zero for the first time, Crucix the Twiceborn’s twin will die and he’ll become enraged. His attacks do more damage now.

Mshell Bss Crx 1a

Plus, after a three-hit combo, he’ll do a Spartan Kick that knocks you down.

Mshell Bss Crx 1b

Anyway, grab the Glimpse of Oblivion after killing the boss. It’s a consumable that provides you glimpses.

Mshell Bss Crx 1c

Gland Run

Next, take the gland so we can begin the level’s “Gland Run” mode.

Mshell Bss Crx 2a

There’s a nearby teleporter that you can use, and you’ll need to traverse the Seat of Infinity – Dim Gate area. It got a lot dimmer than before, that’s for sure.

There are also loads of mobs here, and it’d be unrealistic to try and kill them all. Just make sure you interact with every Sester Genessa you encounter so you can save from that location in case you die.

Mshell Bss Crx 2b

Oh, and if you speak to Brother Corvid while carrying a gland, he still doesn’t say anything new.

Mshell Bss Crx 2c

Make your way back to Fallgrim Tower and bring the gland to the Old Prisoner. You’ll get the Knotted enhanced riposte upgrade for your efforts. The ability slows down time so you can unleash deadly combos with ease.


Mortal Shell is available via the Epic Games Store. For more information, check out our guides and features hub.


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Jason Rodriguez
Jason Rodriguez is a guides writer. Most of his work can be found on PC Invasion (around 3,400+ published articles). He's also written for IGN, GameSpot, Polygon, TechRaptor, Gameskinny, and more. He's also one of only five games journalists from the Philippines. Just kidding. There are definitely more around, but he doesn't know anyone. Mabuhay!