Ughavan (celts) are thunderbolts or stone axes usually found on Osun altars. They are obtained by pouring four tins of oil into the hole in which the Ughavan landed when falling from the sky as thunderbolts. Uloko (Iroko) is said to be the only tree that can withstand Ughavan while other trees shatter. According to oral tradition, Ughavan is believed to be thrown by Ogiuwu, king of death, also known as god of thunder.