Spare the Dying

From Player's Handbook, page 277.

Description
Necromancy cantrip


 * Casting Time: 1 action
 * Range: Touch
 * Components: V, S
 * Duration: Instantaneous

You touch a living creature that has 0 hit points. The creature becomes stable. This spell has no effect on undead or constructs.

Learned By

 * Classes: Artificer, Cleric
 * Subclasses: Sorcerer (Divine Soul), Warlock (The Undying), Wizard (Theurgy)
 * Fighting Styles: Blessed Warrior
 * Races: Abyssal Tiefling, Shadar-kai
 * Backgrounds: Golgari Agent