Active: Death raises his scythe and then slams it down dealing damage to enemies hit in a thin line. The first enemy hit is stunned for 1.5 seconds and additionally damaged for 10% of their missing health.
Active: Death blinks behind an enemy champion and touches them with his deadly fingers. The enemy is slowed for 30% for 2 seconds and a portion of their current health as damage. If the victim is slain within 5 seconds, this ability's cooldown is resetted.
Passive: Death collects the souls of fallen units within 1000 / 2000 / 3000 units. He can store up to 100 souls at once and he loses the souls based on how many he has captured. If he has more than 25 but less than 50 he loses 25.
Active: Death frees the souls' energy to strenghten himself, gaining extra effects based on how many souls he has captured for 10 seconds. With 25 souls he gains 10% / 20% / 30% Movement Speed and Tenacity. With 50 souls he also gains 15% / 25% / 35% bonus Attack Damage and Attack Speed. With 75 souls he gains 30 / 50 / 70 Armor and 40 / 60 / 80 Magic Resistance. With 100 souls his Q stuns for 2.5 seconds, his W is a 300-unit radius AOE, and his E also knocks the enemy away from him for 300 units.
I'm gonna publish his quotes and lore later when I'm not this tired.