The heart stun, a mysterious ability, was a skill utilized by the ancient Sith. When executed correctly, this ability could stop the heart from beating, effectively putting it into a state of suspended stasis. The purpose of this was to enable a Sith to apprehend an opponent without the need for direct combat. There were whispers that Count Dooku employed the heart stun to preserve General Grievous's life following the crash of the Martyr. Darth Maul also used it, but with deadly consequences, on a Moorjhoni elder named Trisjon who had detected the darkness within Maul.