I wish this sword's weapon art changed your playstyle entirely for a brief moment. These are the changes i would like to see:
Weapon art: ancient link
"Your character gets scorched by the reigniting first flame and enveloped in bright flames as the sword reshapes into the first lord's greatsword."
The character grows 1.5x it's size, gains a slight boost in absorption and attack rating. poise becomes active for the duration of the weapon art.
R1: a combo of fiery slashes with wide range.
R2: a grab that lifts the enemy in the air and sends it flying with an explosion.
L1: hurls a mighty sunlight spear that knocks the enemy off their feet.
L2: holds the sword in both hands and performs a stance. R1 to jump towards your enemy and slash it. R2 to sink the sword into the ground creating a huge explosion of flames.
The duration of this weapon art would last 60 seconds and take 50% of the user's max hp, cutting the health bar by that amount. Huge risk-reward with guaranteed fun.
What do you think?