Volibear Ability (LoL): Stormbringer
Stormbringer Volibear
R

Range: 700
Cooldown: 140
/ 130
/ 120
Cost: 100
Volibear becomes ghosted and gains 200 / 400 / 600 bonus health, 50 bonus attack range, 25 increased range on Frenzied Maul, and 25% increased size.
Volibear impacts after a 1 second delay, slowing all enemies in an area by 50%, decaying over 1 second. Enemies in the epicenter are also dealt 300 / 500 / 700 (+2.5 per bonus attack damage) (+125% of ability power) physical damage.
Volibear also disables enemy turrets in an area for 3 / 4 / 5 seconds, dealing them the same physical damage.
Stormbringer will cast at max range if cast beyond that.
Effect Radius: 300 (Damage Radius) / 500 (Slow Radius) / 700 (Turret damage and disable radius)
Also i am using this for my build too