- Sold by Greirat of the Undead Settlement for 3,000 souls.
- Sold by the Shrine Handmaid once she has been given Greirat's Ashes.
The Bastard Sword is a greatsword that specializes in horizontal and vertical slashing attacks. It has a similar moveset to the Claymore, though it lacks the latter's thrusting attacks, which limits its reach and makes it difficult to use in corridors.
However, it possesses superior Strength scaling, allowing it to deal high potential damage when two-handed. It is also one of only two greatswords with the Stomp weapon art, and the only one with the upward slash variant (the other, the Executioner's Greatsword, has the horizontal spinning slash), allowing it to be used to win trades against other players who are using similar-sized weapons. For these two reasons, the Bastard Sword can be quite powerful in the right hands with a Heavy infusion.
|Horizontal slash from right to left, followed by another slash from left to right if pressed once again.|
|Toss weapon over shoulder to gain momentum to launch a thrust attack, followed by a chargeable slash starting behind the player on their left ending on right.|
|Downward slash smashing the ground followed by a upward slash reaching overhead.|
|Slanted slash from down right to over the shoulder left, followed by a left to right slash similar to the second slash of the one handed strong attack but slightly higher (one hand will end in the ground while two handed does not).|
|Jump Attack||Small jump followed by a vertical smash to the ground.|
|Same as one hand jump attack.|
|Running Attack||Throws the blade behind the character back to perfom a 360° apin attack.|
|Same move as the one hand run attack with a smaller recovery time after the attack.|
|Rolling Attack||Quick smash to the floor.|
|Same as the one hand roll attack.|
|Kick||Regular kick animation.|
|Unchargeable version of the one hand second strong attack.|
Reinforced with Titanite.