Mortal Shell 2: How to Get the Obsidian Hammer

To get the Obsidian Hammer in Mortal Shell 2, you must defeat the optional boss, the Forged Colossus, in the Sunken City. The hammer drops automatically when the boss dies; no additional quest or item is needed. This guide covers the full process, including the location, preparation, and the weapon’s stats.

Where to Find the Forged Colossus

The Forged Colossus is located in the Sunken City, an optional area accessible after you obtain the Drowned Tome from the Crypt of the First Martyr. The entrance to the Sunken City is a hidden passage behind a waterfall in the eastern part of the Fallen Temple. Once inside, the boss arena is at the very bottom, past the flooded corridors and the room with the three levers. The boss is a massive, stone-and-bronze construct that uses heavy slam attacks and a shockwave that covers the entire arena.

Preparation: What You Need Before the Fight

Do not attempt this fight under-leveled. The Forged Colossus hits hard and has a large health pool. Here is what you should have before entering the arena:

• Weapon: A fully upgraded weapon (at least +7). The Hammer of the Fallen is a good choice because it staggers the boss easily.
• Shell: The Martyr’s Shell is recommended for its high stamina and resolve regeneration. The Eredrim Shell also works if you prefer a tankier approach.
• Items: At least 3 Quenched Flasks, 2 Gland Extracts (to heal), and 1 Resolve Tonic.
• Abilities: Unlock the “Hardening” skill that reduces stamina cost, and the “Resolve Gain” passive from the Martyr’s Shell.

If you are struggling with the boss’s shockwave, equip the “Stone Skin” ability from the Eredrim Shell, which reduces damage while hardened.

Step-by-Step Boss Fight Strategy

The fight has three phases, and the strategy changes slightly each time. Here is a reliable method:

1. Phase 1 (100%-70% HP): Stay at mid-range. The boss will do a two-hit combo (left swing, right swing). Dodge through the first swing, then punish with two light attacks. When it raises its arms overhead, back off immediately—that is the unblockable slam.
2. Phase 2 (70%-30% HP): The boss gains a new move: a triple ground slam that sends out three waves. Jump over each wave, or use hardening to tank one wave. After the third wave, the boss is exhausted for 3 seconds—use a heavy attack to stagger it.
3. Phase 3 (30%-0% HP): The boss enrages. Its attacks are faster, and it adds a grab attack that drains your resolve. Keep your distance and wait for the double-swing combo. After the combo, it always follows up with a headbutt—dodge that, then you have a safe window to attack.

Do not get greedy. Two hits max per opening. The boss has a hidden stagger meter; hitting its legs (not the torso) builds it faster. Once staggered, you can perform a visceral attack for massive damage.

Obsidian Hammer Stats and Moveset

Once you have the hammer, equip it from the inventory. Here are its full stats at base level:

• Damage: 34 (Physical)
• Scaling: Strength (B), Agility (D)
• Weight: 12.0
• Durability: 100
• Special Effect: +20% damage to enemies with less than 30% HP (executioner’s bonus).

The moveset is a standard hammer, but the heavy attack has a unique property: it charges up a shockwave that travels along the ground. This shockwave does 50% of the hammer’s damage but can hit multiple enemies. The running heavy attack is a lunging uppercut that launches small enemies into the air.

Common Mistakes and How to Avoid Them

Many players fail this fight due to a few recurring errors. Here is how to avoid them:

• Blocking the shockwave: The shockwave cannot be blocked, only dodged or jumped. If you try to block, you will take chip damage and lose stamina.
• Using heavy attacks in phase 1: The boss has a fast recovery after its combo. A heavy attack will leave you open. Stick to light attacks until phase 2.
• Not using hardening: Hardening is your best tool. When you are about to get hit, harden instead of dodging. The boss’s attacks have long wind-ups, so you can harden, take the hit, then attack while the boss is recovering.
• Forgetting the environment: The arena has pillars. You can use them to block the boss’s charge attack, but be careful—they break after two hits.

Is the Obsidian Hammer Worth It?

Yes, but with caveats. The hammer is one of the highest base-damage weapons in the game, and the executioner’s bonus makes it excellent for finishing off tougher enemies. However, its slow swing speed means you will struggle against fast enemies like the Hollow Rogues. It pairs best with the Martyr’s Shell, which gives you enough stamina to swing it three times. If you prefer a faster playstyle, the Hallowed Sword is a better choice. But for pure damage per hit, the Obsidian Hammer is the best.

Alternatives to the Obsidian Hammer

If you cannot beat the Forged Colossus, or if you want a similar weapon without the boss fight, consider these alternatives:

• Hammer of the Fallen: Found in the Fallen Temple. Lower base damage (28) but has a faster swing speed. Requires no boss fight.
• Great Mace: Found in the Crypt of the First Martyr. Slightly less damage (31) but has a longer reach. You need to solve a puzzle to get it.
• Fists of the Unbroken: Not a hammer, but they have high stagger and are easier to use. They scale with Agility.

If you are determined to get the Obsidian Hammer but the boss is too hard, you can come back later with a fully upgraded weapon and more Resolve. The boss does not scale with your level, so over-leveling is a legitimate strategy.

Frequently Asked Questions

Can I get the Obsidian Hammer without fighting the boss?

No. The hammer only drops from the Forged Colossus. There is no other way to obtain it, and it cannot be purchased from any merchant.

Does the Obsidian Hammer have a special ability?

Yes, it has the “Executioner’s Bonus” that deals +20% damage to enemies below 30% HP. This stacks with the Eredrim Shell’s executioner skill, making it very strong for finishing boss phases.

Is the Forged Colossus optional?

Yes. The Sunken City is entirely optional. You can finish the game without ever entering it. The boss is only required if you want the trophy and the hammer.

What is the best shell to use with the Obsidian Hammer?

The Martyr’s Shell is the best because it has high stamina and resolve regeneration. The Eredrim Shell is a second choice if you want more health and damage reduction.

Can I upgrade the Obsidian Hammer?

Yes, you can upgrade it at any anvil using Glimpses and Quenched Flasks. At +10, its damage reaches 51, and the executioner’s bonus increases to +30%.

Does the hammer break?

Weapons do not have durability in Mortal Shell 2. The durability stat listed is misleading—it only affects how much damage you deal when the weapon is at low integrity, but it never breaks completely. You can repair it at an anvil for a small cost.

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