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The Obsidian Greatsword is a greatsword in Dark Souls. The weapon is exclusive to the Artorias of the Abyss DLC.

In-Game Description

This greataxe,[1] one of the rare dragon weapons, is formed by the tail of the one-eyed black dragon Kalameet, the last of the ancient dragons.
The mystical power of its obsidian blade will be released when held with both hands.


Obtained by cutting off the tail of Black Dragon Kalameet.


When wielded with two-hands, the Obsidian Greatsword requires only 14 Strength. The two-handed strong attack unleashes an area-of-effect attack reminiscent of Kalameet's fire breath and causes high stamina drain for anyone who blocks the hit. This attack uses 50 durability.

While the Obsidian Greatsword has no scaling, it has great base damage and good weight for a greatsword. Its low requirements make it a good greatsword for players who do not want to invest in either strength nor Dexterity. In particular, the lack of scaling means that even one-handed, the Obsidian Greatsword packs a punch. The next strongest greatsword, the Man-serpent Greatsword, would require 23 strength to match the Obsidian Greatsword's damage output two-handed and 34 one-handed.

Unusual for a unique weapon, the Obsidian Greatsword can be augmented. The weapon's ability to be augmented coupled with its high damage and relatively low requirements means that it is a good choice for augmentation builds. Augmentations can also significantly buff the damage of the strong attack AOE.


Attack Description
Weak Attack
Somewhat quick horizontal slash.
Strong Attack
Somewhat slow overhead smash.
Weak Attack
Somewhat quick overhead smash.
Strong Attack
Users slams the greatsword into the ground and emits black and gold fire from the weapon.
Jump Attack Forward jumping smash.
Running Attack User turns weapon 360° horizontally around self.
Rolling Attack Quick overhead smash.
Kick Standard kick.
Weak Attack
Strong Attack
Slow horizontal slash.


Requires: Dragon Scales and 10,000 souls per upgrade.

Variation Attack Values Parameter Bonus Damage Reduction
Physical Damage Magic Damage Fire Damage Lightning Damage Strength Dexterity Intelligence Faith Physical Reduction Magic Reduction Fire Reduction Lightning Reduction
Obsidian Greatsword 320 60 10 40 40
Obsidian Greatsword +1 (Dragon Scale ×1) 352 60 10 40 40
Obsidian Greatsword +2 (Dragon Scale ×1) 384 60 10 40 40
Obsidian Greatsword +3 (Dragon Scale ×2) 416 60 10 40 40
Obsidian Greatsword +4 (Dragon Scale ×2) 448 60 10 40 40
Obsidian Greatsword +5 (Dragon Scale ×4) 480 60 10 40 40


  • The Obsidian Greatsword is labeled as a greataxe in its item description, compared to it being labeled as a greatsword in the weapon's stats menu. This is probably a translation error.
  • The Obsidian Greatsword has a similar, if not the same, moveset as the Bastard Sword (excluding two-handed strong attack).
  • The sword is likely a reference to the Darkslayer The moonlight greatsword's counterpart in king's field albiet obtained from seath in that game series and not guyra(who shares his design with kalameet).



  1. In-game description refers to it as a greataxe, even if it is indeed a greatsword.