The Fomorians from Irish mythology are steeped in mystery. It is unknown where they came from, or the length of time they had knowledge of Ireland, and what actually happened to them. Lady Gregory describes one Fomorian habitat as a glass tower in the sea. Many people describe them as sea fairies or sea monsters. My best guess is that they were Nephilim!
Balor In the Celtic-Irish mythology, Balor is the god of death and the king of the Fomorians, a race of giants. Balor had only one eye, which he kept closed because anything he looked at would die instantly.
The Irish legend of the Children of Lir is about a stepmother transforming her children into swans for 900 years. In the legend The Wooing of Etain, the king of the Sidhe (subterranean-dwelling, supernatural beings) transforms himself and the most beautiful woman in Ireland, Etain, into swans to escape from the king of Ireland and Ireland's armies. The swan has recently been depicted on an Irish commemorative coin.
THE BANSHEE is a female spirit in Irish mythology, usually seen as an omen of death and a messenger from the underworld. In legend, a banshee is a fairy woman who begins to wail if someone is about to die. In Scottish Gaelic mythology, she is known as the bean sìth or bean-nighe and is seen washing the bloodstained clothes or armour of those who are about to die.
In Irish mythology, the Morrigan ("phantom queen") was a war goddess who would sometimes take the form of a crow. She would fly over battlefields like this, inspiring fear in the hearts of those below.
A Phooka is a dangerous and often violent shapeshifting trickster from Celtic myth, known for their ability to change into great, fearsome black animals to scare humans. Some Phookas take a liking to humans and just play harmless pranks, other Phookas are blood-thirsty vampire-like creatures which lure humans to their doom.