Goibniu also was known as Goibhniu or Gofannon and origin is Celtic. Goibniu is a sacred smith. Goibniu creates weapons for the Tuatha De Danaan as well as favoured devotees. Weapons made by Goibniu will always find their target to kill. Goibniu is the host of the otherworld feast at his roundhouse. Not only is Goibniu a smith also a brewer that brews unique ale from the fruits of the otherworld tree. Those that drink this ale will remain youthful, vital and remain immoral.
Judika Illes, Encyclopaedia of Spirits the ultimate guide to the magic of fairies, genies, demons, ghosts, gods and goddesses, 2009, Goibniu, p 446