From publisher blurb:
Menace on the Moors
Mythic Monsters: Celtic brings you an awesome array of marvelous and menacing creatures from the misty moors and hollow hills of Celtic lands. Drawn from the myths and legends of ancient Scotland, Ireland, and Wales, these cunning creatures range from CR 1 to CR 18. Some are friendly if prone to dramatics and wild passions, like the invisible pooka and the romantic gancanagh azata, while others are not necessarily unfriendly but can be irascible and prickly, like the giant-kin firbolg and the bug-bodied water leaper. Some Celtic creatures are dangerous not from hate, but merely from an alien outlook on the relationships of the races, like the parasitic apluachra and the lake-loving nixie, but for others mischief is laden with malice like the fuach gremlin, the blood-hungry spring-heeled jack, and the savage half-bodied fachen, and the murderous water-centaur nuckelavee. Finally, Celtic culture is replete with dark omens and harbingers of death like the spirit-swarming nemhain and the terrifying death coach. Plus you’ll also find the brand-new minister of mortality, hastening the demise of all within its domain, with the elder doom spirit cyrhyraeth! As if a dozen and one monsters were not enough, you’ll also find the heirs of Boudicca and her warrior women in the fantastic blue-painted warrior archetype, with both standard and mythic versions!