Al'zerac's Shackle

Instantly Freeze target enemy in a block of ice for 3 seconds, incapacitating them for the duration. While frozen, the target takes 174% frost damage every 1.5 seconds for the duration. Upon Expiration, the target erupts in an explosion of frost magic, instantly dealing 63% frost damage to all enemies in an 800 radius and Chilling them, reducing their Movement Speed by 65% and their Attack Speed by 40% for 12 seconds. While Chilled, the afflicted enemies take 25.2% frost damage every 2 seconds for the duration. Can be cast during Global Cooldown