In Norse mythology, Níðhöggr (Malice Striker, often anglicized Nidhogg) is a dragon who gnaws at a root of the world tree, Yggdrasil. In historical Viking society, níð was a term for a social stigma implying the loss of honor and the status of a villain. Nidhogg chewed the corpses of the inhabitants of Náströnd: those guilty of murder, adultery, and oath-breaking, which Norse society considered among the worst possible crimes. (Wikipedia) Image by Nightpark (Image #200075)
The Horned God is one of the Irish Gods who represents the male aspect of divinity, but he also represents the earth and the changing seasons. At Imbolc, he is a young boy playing in the meadows. By Beltane, he is a fertile, virile young man ready to mate with the Goddess. By Samhain, he is old and dying but will be reborn again on Yule.
.Leshy or Lesovik is a spirit in Slavic mythology who protects wild animals and forests. There are also leshachikha/leszachka (wives of the leshak) and leshonky (children of the leszy). He is roughly analogous to the Woodwose of Western Europe and the Basajaun of the Basque Country. Leshy is the protector of all animals and birds in the forest. Mass migration of animals supposedly happens at leshy's instruction.
In Irish mythology Goibniu (Old Irish) or Goibhniu (Modern Irish) was the smith of the Tuatha Dé Danann. He and his brothers Creidhne and Luchtaine were known as the Trí Dée Dána, the three gods of art, who forged the weapons which the Tuatha Dé used to battle the Fomorians. His weapons were always lethal, and his mead gave the drinker invulnerability.