The Obsidian Hammer is a heavy, slow-swinging blunt weapon tucked away at the bottom of the Obsidianite Mines, a dungeon in the Mammon region of Mortal Shell 2. It is Proxima’s signature melee weapon, and you earn it by killing the boss waiting at the end of the mines rather than simply picking it up off the ground.
Quick answer: Fast travel to the Outskirts of Mammon Beacon, head west into the Obsidianite Mines, drop through the collapsing floor and chasm to the boss arena, then defeat the Prophet of Profane Infinities. The hammer drops the moment the boss dies.
Before you go: access and requirements
The Obsidianite Mines sit close to the Outskirts of Mammon Beacon, so you can reach the hammer fairly early once Mammon opens up. Getting there depends on clearing the corruption blocking Marrow Keep’s southern jump pad, which connects you to this stretch of the region.
Every enemy in Mammon hits hard and carries high health, and the mine’s boss is a tougher version of the hammer-wielding Hierarchs you meet elsewhere. If you are underleveled, expect a rough time and a full rerun of the route if you die, since there is no checkpoint right before the fight.
Note: If you would rather have the spot pinned on your map instead of navigating by memory, Merrick in Marrow Keep sells a map fragment that marks the Obsidian Hammer’s location for coins.
Route to the Obsidianite Mines entrance
Descending the mines to the boss arena
The mine’s layout is built around dropping down through the level, so it can feel disorienting on a first run. The path below takes you straight to the boss.
Tip: You can cancel fall damage by pressing the light attack button while falling from height. This is worth doing on the longer drops so you don’t arrive at the fight with chipped health.
Beating the Prophet of Profane Infinities
The boss is a slow, hammer-swinging opponent with a predictable moveset, which makes his attacks easy to read once you settle in. Dodging or parrying his heavy swings is the reliable approach, since he telegraphs each one. The real danger is being underleveled, where his damage output alone can end the run.
Bring a well-upgraded weapon and stay patient between his swings. When he goes down, the Obsidian Hammer drops as your reward and lands in your inventory immediately.
Obsidian Hammer stats and upgrades
The Obsidian Hammer trades speed for weight. It swings slowly, in the same vein as the Great Martyr’s Blade, but it hits hard, has a versatile moveset, and staggers enemies well. Its weapon ability is Heavy Stomps.
| Detail | Value |
|---|---|
| Type | Blunt melee weapon (slow, high stagger) |
| Location | Obsidianite Mines, Mammon |
| How to get | Defeat the Prophet of Profane Infinities |
| Ability | Heavy Stomps |
| Early upgrade material | Ventrium (later levels use Laterite) |
To strengthen it, take the hammer to the Tarforge in Marrow Keep. Early levels are fed with Ventrium, while higher ranks require Laterite, alongside coins. Since materials get scarcer at each tier, it pays to commit to a few weapons rather than spreading upgrades thin.
Because the boss and route are tied together, this is also one of the eight melee weapons counted toward the Lord of War trophy, so clearing the mines checks another entry off that list while handing you a heavy-hitting option for the rest of Mammon.
