Dota 2/Rylai the Crystal Maiden

Crystal Maiden is a ranged intelligence hero that is almost always played as a dedicated support. She has a very helpful aura that covers the entire map, giving her allies mana regeneration. She is also a great disabler with her Crystal Nova and Frostbite. Her ultimate, Freezing Field, can hinder any hero's escape as her teammates catch up. Crystal Maiden, being a support intelligence hero, is very frail. Get caught out of position, and she will go down within seconds.

Crystal Nova
Crystal Nova lets you cast a damaging burst of ice that slows enemy movement speed and attack speed. A useful slow, it can slow a bunch of enemies at once. The movement speed slow inhibits an enemy hero's escape, while in the late game the attack speed slow helps nullify the enemy carry's high damage output.
 * Ability: Target Point
 * Damage Type: Magical
 * Damage: 100/150/200/250
 * Duration: 3.5/4/4.5/5
 * Radius: 400
 * Movement Slow: 30%
 * Attack Slow: 20%
 * Mana Cost: 100/120/140/160
 * Cooldown: 15