Crystal Slash and Fracture build stacks of Crystallizing Sting on the target enemy, stacking up to 3 times.
If Skarner uses a basic attack against an enemy at 3 stacks, the stacks are consumed and his attack is modified to deal「 15 + (5 × Skarner's level) 」「 20 / 25 / 30 / 35 / 40 / 45 / 50 / 55 / 60 / 65 / 70 / 75 / 80 / 85 / 90 / 95 / 100 / 105 」(+ 100% AD) magic damage and stun the target for 0.5 / 0.75 / 1 seconds. This effect and Crystallizing Sting's stack application cannot occur on the same target more than once every few seconds.
Active:Skarner rears his stinger, rooting his target for 0.25 seconds as he brings it down, dealing them magic damage and suppressing them for 1.75 seconds. At the end of the duration, the target takes the same damage again.
If Impale's suppression is removed via a method of crowd control removal such as Quicksilver, the secondary damage is not dealt.
If Skarner loses sight of his target or if his target exceeds a range threshold during the initial 0.25 seconds, the ability is cancelled but does not go on cooldown.
Impale's target can exceed the threshold either by being in the process of dashing when immobilized, removing the immobilize and then quickly moving away, or by an ally knocking Skarner back.
Skarner's target will follow him around regardless of the method of movement - including through forced movement spells such as Buster Shot and Dark Passage.
While Impale's suppress is active, Skarner is considered to be facing in the direction of his movement, not the direction he is facing, for the purposes of abilities such as Petrifying Gaze and Mocking Shout.