Heartbane
From HGWiki
Caster Level(s): Assassin 4, Cleric 4
Innate Level: 4
School: Necromancy
Descriptor(s): Evil
Component(s): Verbal, Somatic
Range: Medium
Area of Effect / Target: Single
Duration: Instant
Additional Counter Spells:
Spell Resistance: Yes
Description: The caster summons the power of his diety to rip the still beating heart from a living creature. The target may attempt a Will save to resist the caster's call, and if failed, must make a Fortitude save or die instantly. A successful Fortitude save still inflicts 3d6 points of damage. Only immunity to critical hits or Devastating Critical protects from this spell. Both DCs receive a +5 bonus.
Notes
Can only be used by casters of an evil alignment.
There are multiple creatures who's paragon iterations are still vulnerable to this spell whilst being immune to the higher level Implosion, eg Erinyes Vitiarch, Spinarch, Kyton Legionaire, etc.
Whilst this is an Assassin class spell it will (in most if not all cases) be ineffective due to lack of caster levels (maximum 50), primary stat (would be cast with Int), spell foci and spell penetration.