Broken Heart

You wrap a spectral hand around the heart of a giant-sized or smaller target within range and squeeze. The target must make a constitution save and then roll a d12, adding 3 to the roll if they succeed on their save.

D12 spell effects
1: the heart of the creature is crushed. It instantly dies.
2-4: The creature looses half of its remaining HP
5-10: the target is paralyzed for 1d4 rounds taking 4d6 force dmg each round
11+: the target suffers 4d6 force damage as excruciating tremors run through its heart and is stunned until the end of its next turn.