Locke Ability (LoL): Purgatory

Locke throws a binding artifact to a location, dealing 150 / 225 / 300 (+60% of ability power) magic damage and slowing enemies in the area by 99%, decaying over 2 seconds. The artifact marks enemies hit for 5 seconds, sealing away marked enemy champions brought below 10 / 11 / 12% of the target's maximum health, and resetting the duration of the mark on other affected champions.

After the duration ends, if at least one champion was sealed, the artifact lands on the ground. Locke can pick up the artifact to permanently gain a Sealed Champion stack which increases its execution threshold by 0.5% per stack, and refund 20% of his current cooldown, for each champion sealed.