In one story, Marie-Louise Daniel —Ploumilliau, he comes on Christmas eve to collect a blacksmith who is still working after midnight [a reminder people died by overwork]. In another he is an uninvited guest at a party. He is god of the dead, ancestor of the Celts, and master of the cosmos. grym: strength [pron GRIM].
In the Saga of Grettir the Strong he is Grim, the forest man, who catches fish, and decapitates Hallmund the god of rebirth with an axe. He stays at Arnarvatn Heath all winter after Hallmunds death. As Czernobog: Black God, he is the Ahriman of Slavonic dualism. Vladimir Tytla is the artist responsible for animating Tchernobog, the demon, in Fantasia. His rowanberry red aspect is Crom Dubh (13, 176)
Yn Baase (Church Grim) Ghostly black dogs, the size of large retrievers, that guard churchyards from the Devil and hags. Do not speak, stare, or touch as it invites death. In some places the spectral dog is named Shuck and is said to be headless. Black dog types: Mauthe Doog, the Black Dog of Peel Castle in the Isle of Man and the phantom black dog in Sir Arthur Conan Doyles The Hound of the Baskervilles Mauthe means toll in German. Barguest, Shriker, Teurst English goblin with horns, claws, rows of sharp teeth, glowing red saucer eyes and clanking chain. Appears as a donkey, pig, calf, human, or shaggy black dog. (6, 13, 14, 19, 210)