Volibear

Bite the target and mark them, dealing X physical damage, increased by 60% if they are already marked. After casting 5/5/2 times, leap to a nearby hex, activating Stormbringer and dealing X physical damage to enemies within a two hex radius.

Stormbringer: Gain 400/550/9999 Health and 50/50/999% Attack Speed. Every 2/2/0.3 seconds, summon a lightning bolt on a nearby enemy, dealing X magic damage. Takedowns summon a bolt on fallen enemies.

Exact values aren't in Riot's published Set 16 data (shown as X).