The Grafted Blade Greatsword in Elden Ring is a colossal sword forged from the swords of an entire clan of warriors.
You are correct if you have seen this sword design elsewhere. This greatsword is one of the many easter eggs in the Elden Ring. This weapon is a direct reference to the Iron Throne in A Song of Ice and Fire novels by author George R. R. Martin, who is also incidentally the world builder of Elden Ring.
As you may expect, this weapon can only be wielded by a mighty warrior with high strength stats.
Grafted Blade Greatsword Location

Grafted Blade Greatsword can only be obtained as a drop after killing the Leonine Misbegotten boss. You can find this boss at the end of Castle Morne.

Castle Morne is an optional location in the southernmost part of Limgrave, known as Weeping Peninsula. You will also visit this area during Irina’s Questline, who will ask you to deliver a letter to his father Edgar inside the castle.

This castle is overrun by demi-human enemies, which will attack you indiscriminately. Make your way to the end of the Castle Morne, and you will notice a fog gate near the shore.

Leonine Misbegotten is a difficult enemy at lower levels. He hits like a truck and moves at enormous speed. Unless you are looking for a serious challenge or want to get his sword early, we won’t recommend attempting this fight early in the same.
Once you defeat Leonine Misbegotten, he will drop the Grafted Blade Greatsword as a reward.
Grafted Blade Greatsword Stats and Requirements
Grafted Blade Greatsword is a colossal sword that requires 40 Strength and 14 Dexterity to wield. It has C scaling with Str and E scaling with Dex.

The unique skill for this sword is called Oath of Vengeance, which grants you 5 points for each attribute for the next 60 seconds. You also get super armor for the next 5 seconds. This weapon weighs 21, making it very difficult to wield without getting overcumbered.
Grafted Blade Greatsword can’t be infused with magic or any consumables. You also can’t apply any Ash of War to it either. It can only be upgraded up to +10 with the help of Somber Smithing Stones.
At its highest level, it deals 396 Physical Damage and can be sold for 200 runes to any merchant in the game.
Grafted Blade Greatsword Best Build
For this build, we will be using a fully upgraded Grafted Blade Greatsword in addition to a +25 Finger Seal. For the headgear, go with the White Mask of Varre, as it increases your attack power in case of bleeding.
For the rest of your body, use the Tree Sentinel Armor Set. As this is an end-game/NG+ build, distribute your points as follows.
- Vigor: 40
- Strength: 60
- Dexterity: 21
- Faith: 30
Use the following spells before engaging in any battle.
For the talismans, go with the following.
- Dragoncrest Greatshield Talisman
- Green Turtle Talisman
- Great Jar’s Arsenal
- Assassin’s Crimson Dagger
Mix the following crystal tears in the Flask of Wondrous Physick.
- Greenburst Crystal Tear
- Opaline Hardtear