The Banshee, from the Irish “bean sí” (“woman of the síde” or “woman of the fairy mounds”) is a female spirit in Irish folklore, usually seen as a harbinger of death, as well as a messenger from the Otherworld. In Irish legend, a banshee is a fairy woman who begins to wail if someone is about to die.
In Celtic mythology, Lugh or Lug was a god of the sun and light known for his handsome appearance and skills in arts and crafts. A patron of heroes, Lug appears in many Irish and Welsh legends. Lug was the son of Cian and the grandson of Balor, the king of the evil Formorians, a race of violent, supernatural beings who lived in darkness. Lug became king of the Tuatha Dé Danaan, married the mortal woman Dechtire, and had a son named Cuchulain, who became a great hero.
The Morrígan ("phantom queen") In Irish mythology she is a goddess of battle, strife, and sovereignty. She sometimes appears in the form of a crow, flying above the warriors, she also takes the forms of an eel, a wolf and a cow. She is generally considered a war deity comparable with the Germanic Valkyries. She is often depicted as a trio of goddesses, all sisters, although the triad varies; the most common combinations are Badb, Macha and Nemain. or Badb, Macha and Anand.