A very long time ago, a void created two beings, a god, and a goddess. They were named Donn and Danu.
As soon as they met they loved each other. They loved each other so much that when they interlocked fingers they were stuck. Eventually they made children and since Donn and Danu were still interlocked between each other their children were stuck.
One of Danu's children Briain knew That in order for him and his siblings to survive he needed to separate his parents. The love for her husband was not as strong as the love for her children, so she let Briain kill his father. Briain was so angry he cut his father into nine parts. Danu was heart broken at the sight she cried so much her tears flooded all her children away.
Danu's tears also flooded away Donn body parts. His breath became the wind, his bones the stones, his mind the moon, his face the sun, his brain the clouds, his blood the ocean, and his head the skies.
In time Donn came back as a seed and another seed came with him, Danu cried again at the sight of seeing her husband. Danu's tears made the seed grow into a tree, and with his leaves Donn wiped Danu's tears. The tears made berries bloom on the tree which formed the first humans. The humans were really lazy though, they were lazy because they could not die. The other seed that came with Donn was Finn.
Finn was a priest, and when Donn said he wanted to renew the world by making humans able to die Finn disagreed. So Donn and Finn got into a fight that lasted a very long time, but eventually Donn won and when he noticed what he did he could not bare the pain and he exploded. The pieces of Donn renewed the world, and after Donn died death did come to mankind. The roots of the tree became the underworld or were you go after death. To this day Donn and Danu are still love each other very much even though they are separated.