Celtic witches are strange witches are in some ways different from the witches of the county. They work together with the goat mages of Ireland sometimes and never really form clans. Some celtic witches produce children for undead people called keepers.
Celtic witches are seen in the Spooks stories: Witches and Spooks Destiny when one is a sacrifice for the old god pan
Little is known about the Celtic witches, It was told in Spook's Stories Witches that they belong in south western Ireland.