"The Beast of Boredom" by Richard R Smith was originally published in Infinity magazine, April 1958. SNYPSOS: After killing a Martian, a man takes a strange artifact back to Earth. He soon realizes it's a very unique weapon - and he is it's victim - and there may be no defense against it.
BONUS AUDIO: "The Beast of Boredom" by Richard R Smith #WeirdDarkness | Weird Darkness: Stories of the Paranormal, True Crime, Legends, Lore, Mysterious, Macabre, Unsolved podcast - Listen or read transcript on Metacast