To upgrade the Star-Lined Sword to +10 in Elden Ring, you will need Somber Smithing Stones6. These stones are used to enhance the weapon's attributes and improve its overall performance. Make sure to collect enough Somber Smithing Stones as you progress through the game to fully upgrade the Star-Lined Sword and maximize its potential.
The Star-Lined Sword is located in the Elden Ring's Shadow of the Erdtree expansion. You can find it by defeating Demi-Human Queen Marigga in the Charo's Hidden Grave region. Fast travel to the Cerulean Coast West Site of Grace, head northeast around the nearby structure, and follow the ravine while sticking to the left side. Defeat Demi-Human Queen Marigga to obtain the sword.
The Star-Lined Sword's combo can be extended by using its unique Ash of War, Onze's Line of Stars. This Ash of War applies sorcerous energy to the sword, allowing you to perform a series of attacks that become more powerful with each consecutive hit. By repeating the input for the Ash of War, you can extend the combo and deal increased damage to your enemies.