This series of two games followed the story of Cuchulainn, a Celtic hero, and are deeply steeped in ancient Celtic mythology.
The first game in the series, Tir Na Nog occurs after the death of Cuchulainn as he enters the Land of Youth, or the Celtic afterlife. His quest is to find and reunite the pieces of the Seal of Calum in order to bind a mysterious Great Enemy.
The sequel, Dun Darach told the story of Cuchulainn as a young man. Following a great battle, Cuchulainn is travelling home with his trusty charioteer Loeg. While at an inn, Loeg is tricked into helping a mysterious stranger and is captured. It turns out that the stranger was the Sorceress Skar, determined to exact revenge for the defeat. Cuchulainn must enter the secret city of Dun Durach to defeat Skar and rescue Loeg.
The games were written by Greg Follis and Roy Carter of Carter Follis Software Associates. They were distinctive in that (in the original releases) the manuals included rich background histories that tied the games into their Celtic mythology.