The Master Thief, Champion Concept

Little bit of story: I won't go too in depth, as I don't have extensive knowledge on the lore behind all of the Legends and their respective nations and what not, but I imagine this character being either from Demacia or Zuan or maybe Piltover who's gotten a lot of fame from being a professional thief, but who's anonymous, obviously, or was. He or she has magical abilities that help them be such an influential thief. After a botched heist he or she turns to running and evading from guards and others who may want to kill him, smiling the whole way.

Passive: Power Thief After landing 3 separate attacks or abilities on an enemy champion, gain 3 + 3% of their attack and ability power converted to Adaptive Force. The target loses the stats you gain. These effects last 5 seconds and refresh on you and champions effected when you gain another stack of Power Thief. This can stack 3 times and smaller bonuses are replaced with larger ones if you are at maximum stacks.

Q, First Ability: Throwing Daggers Pulling daggers from your belt, throw them, one after another, in a straight line. If a unit is struck by both daggers, they take additional damage. Each dagger counts as a separate attack for the purpose of Power Thief's stack generation. The rate at which these daggers are thrown increases as you gain levels.

W, Second Ability: Back-up Plan Stab a dagger into the ground that has a rope attached. The dagger stays in place for 8 seconds or until you leave a hefty distance away from it. On reactivation, yank yourself back to where the dagger is.

E, Third Ability: Discharge While you have any amount of stacks of Power Thief, this ability is usable. When used, you lose all stacks of Power Thief and add magic damage to your next attack based on how many stacks lost. This attack's damage increases the lower your target's health is and the attack explodes, dealing a set damge based on stacks lost to any enemy units around your target.

R, Ultimate: Arcane Recovery Activating this ability resets the cooldowns of your basic skills as well as refreshes the duration of any Power Thief stacks you have and refreshing the duration of Power Thief's debuff on champions who currently have it.