To activate the Storm Ruler's skill, Storm King, the player first needs to wield the weapon with both hands and press and hold the Left Strong Attack button ( / ) for five seconds to charge the blade (the blade's charge will not wear out in time).
While still wielding the sword with both hands, press and hold the Left Strong Attack button ( / ) once more to acquire an offensive stance and then press either the Right Weak Attack button ( / ) or the Right Strong Attack button ( / ) to unleash a two-handed slam attack on the ground which will call in a powerful storm, sending it forward.
- The Storm Ruler's skill, Storm King, imbues the blade with the power of storm, allowing it to deal heavy damage to giants.
- This ability can almost be considered a requirement while facing Yhorm the Giant, since most other attacks will deal very low damage to him.
- Hitting Yhorm's upper body with other weapons will still deal heavy damage to him - the bonus damage is not tied to the Weapon Art itself, but rather to Yhorm's upper body. High-reaching attacks, such as those from Ultra Greatswords, can hit for high damage if the attack connects with Yhorm's head or upper body.
- Contrary to the description, the skill only deals high damage to Yhorm. Other giants will take the same amount of damage as any other enemy, and are not staggered by it.
- The Storm Ruler cannot be sold or dropped.
- Yhorm the Giant once held two Storm Rulers. He gave one to the humans who doubted him and left the other to his dear friend, Siegward of Catarina, before facing his fate as a Lord of Cinder.
- Even though it is not a soul-transposed weapon, the Storm Ruler is upgraded with Titanite Scale.
- This weapon and its weapon art are references to the Storm King boss and Stormruler weapon in Demon's Souls.
Reinforced with Titanite Scale.