Momento Mori

Necromancy [Death]
Spellcraft DC: 86
Components: None
Casting Time: 1 quickened action
Range: 300 ft.
Target: One living creature
Duration: Instantaneous
Saving Throw: Fortitude partial (see text)
Spell Resistance: Yes
To Develop: 774,000 gp; 16 days; 30,960 XP. Seed: slay (DC 25). Factor: increase to 160 HD (+8 DC), quickened (+28 DC), no verbal or somatic components (+4 DC), +10 to DC of subject's save (+20 DC).
As a free action that counts as a quickened spell, the character wills the target dead without a word or gesture. The character's thought snuffs out the life force of a living creature of 160 or fewer HD, killing it instantly. The subject is entitled to a Fortitude saving throw (DC 30 + relevant ability modifier) to have a chance of surviving the attack. If the save is successful, the target instead takes 3d6+20 points of damage.