Ice Shards

Ice Shards is a Destruction Cold spell used by  in Diablo IV.

In-game
When cast, spreads 5 bolts of ice that each can deal damage to a single target, with random spread (only the central shard flies where targeted). While the shards' damage is relatively low, even considering the cheap Mana cost and no cooldown, they are very cost-efficient against previously Frozen foes.

Note that this spell does not Chill / Freeze enemies by itself and must rely on other spells. It is also of very arguable efficiency if paired with Endless Winter talent due to drastically reducing available sources of Freeze.

Talents:

 * Potent Warding (5): Elemental damage and resistances are increased by 2% per point.
 * Devastation (5): Critical strike chance is increased by 2% per point.
 * Precision Magic (5): Elemental damage increases over time, up to a maximum of 5% per point after 3 seconds. Attacking resets this effect.
 * Inexorable Reach (5): Damage is increased by 3% per point against enemies outside of melee range.
 * Icy Touch (5): Cold damage is increased by 2% per point.
 *  (5): After casting, next cold skill deals 4% more damage per point.
 * Frostbite (5): Damage against Chilled and Frozen enemies is increased by 2% per point.
 * Burning Resonance (5): Damaging a Burning enemy has up to a 25% chance to restore 2% Mana per point.
 * Endless Winter (1): Critical strike chance against Chilled and Frozen enemies is increased by 30%, but Chill effects no longer Freeze.
 * Chill to the Bone (1): Cold damage against Frozen enemies is increased by 30%.

Trivia

 * This spell's mechanics are likely inspired by the World of Warcraft Mage spell Ice Lance.