The Morrighan is the Irish Goddess of Renewal' although she is more frequently called a Goddess of Battle, her role is more subtle than this.
The Morrighan is a triple aspected goddess, comprising Nemhain, Badbh and Macha. She often appears as a crow over battlefields scavenging the slain. The severed head of the Munster warrior, Fothad Canainne speaks of her thus...
About us on this field are
the bloody horrors of battle,
unspeakable are the guts that
the Morrigan is washing.
She has descended on as a gloomy guest,
hurling us into the fray.
She washes her many spoils,
laughing her dreadful twisted laughter.
She has thrown back her mane;
the heart in my former shape hates her.
However, she is also concerned with sexuality and fertility. She meets with the Dagda on Samhain eve and mates with him at the ford. Their meeting marks the coming together of the great formative powers of the Celtic world, since the end of the summer half of the year also marks the ending of the campaign season; when the Morrighan comes to mate with the Dagda, she lays aside her warring side and with the Father of the Gods, prepares the land for the germination and preparation of winter.
The Morrighan is associated with the Sheela na Gig, a common figure found carved, usually over the Western entrance to churches. She is usually shown as a hag with a gaping, mocking or smiling face, and with both hands opening her distended vulva. The Sheela represents the womb and tomb of life, the essential threshold between the worlds.
Now the doors between the worlds are open once again as we gather to celebrate Samhain, the end of summer, and to welcome the ancestral wisdom once again in the embrace of winter.