Another Javanese folk story tells of Arya Penangsang, the mighty viceroy ("adipati") of Jipang who was killed by his own kris called Setan Kober ("devil of the grave"). It was forged by Empu Bayu Aji in the kingdom of Pajajaran, and had 13 luk on its blade. Near its completion when the empu tried to infuse the weapon with spiritual power, he was disturbed by a crying demon (djinn) from the graveyard. As a result, although powerful, the kris had a temperamental evil nature that caused the wielder to be overly ambitious and impatient.