viking . world tree from scandinavian mythology - yggdrasil and celtic knot. drawn in old norse celtic style

forest silhouette illustration vector art logo design decoration celtic symbol viking medieval wicca pagan heathen mythology magic mythical ancient scandinavian norway north barbarian ragnarok sign old sacred yggdrasil odin scandinavia vintage plant branch tree natural wood foliage midgard triskele tribal decorative triple witchcraft ethnic contrast white monochrome emblem mystic