4th-level · Necromancy
Casting Time 1 reaction, which you take when a friendly creature within 60 feet drops to 0 hit points
Range 60 Feet
Components V
Duration Instantaneous
Classes Warlock, Wizard
Sometimes one must fall so others might rise. When a friendly creature you can see within range drops to 0 hit points, you can harness its escaping life energy to heal yourself. You regain hit points equal to the fallen creature's level (or CR for a creature without a level) + your spellcasting ability modifier.
Source: Tome of Heroes · OGL/Open