Magic disease that befalls anyone who have ever tortured a leprechaun. Leprechauns are not part of Christian faith. Because of this, Jesus actively fought the green tricksters by healing their victims so they would convert to Christianity
Luke 5:13-14: 13. Jesus reached out his hand and touched the man. “I am willing,” he said. “Be clean!” And immediately the leprosy left him in a bright light that eventually formed a rainbow.
14. Jesus knew what needed to be done. He would followed the rainbow into the creatures den and he slew the helpless beast. In that moment he blessed his flaming sword and as it absorbed the soul of the Leprechaun .