Innate: Upon taking fatal damage, Sion briefly becomes untargetable and enters a frenzy, restoring himself to 100% maximum health but losing 2 - 19 (based on level) every 0.25 seconds, increasing by 70% per subsequent tick.
If the channel is interrupted, Decimating Smash goes on a reduced 2 seconds cooldown.
Second Cast:Sion flails his axe, dealing physical damage to all enemies in the target area, and slowing them by 50% for 0.25 seconds. Decimating Smash deals 80% damage against monsters, and 60% against minions.
If Decimating Smash was charged for at least 1 second, Sion instead slams his axe down, knocking up all enemies hit for 0.5 - 1 (based on channel time) seconds and stunning them for 1.25 - 2.25 (based on channel time) seconds.
Enemies who cannot see Sion while he is inside a brush will neither see Decimating Smash's reticle (like with Absolute Zero)
Active:Sion bellows in the target direction, dealing magic damage to the first enemy hit, slowing them for 2.5 seconds as well as having their armor reduced by 20% for 4 seconds.
65 / 100 / 135 / 170 / 205 (+ 55% AP)
40 / 45 / 50 / 55 / 60%
If the target is a minion or non-epic monster, they are knocked back 775 units, dealing the same damage and applying the same effects to all enemies they pass through. Projectile enemies stop upon colliding with terrain or reaching the end of their trajectory.
Minions and monsters targeted by Roar of the Slayer are invulnerable for the displacement's duration but cannot go through walls.
Active:Sion charges in the target direction for up to 8 seconds, during which he is pacified and immune to crowd control. Sion can adjust his trajectory over the duration at a highly reduced capacity.
Sion slams the ground around him upon colliding with an enemy champion, terrain, charging for the full duration, or re-activating Unstoppable Onslaught. Colliding with structures or terrain briefly stunsSion. If Sion stops directly in front of narrow terrain, he dashes over it.
The slam deals physical damage to nearby enemies and turrets, with the base damage increasing by 0% - 266.67% (based on charge time), the bonus AD ratio increasing by 0% - 100% (based on charge time), while also slowing enemies for 3 seconds. Enemies directly hit by Sion are also pulled into him and stunned for 0.75 - 1.75 (based on charge time) seconds.