ancient scandinavian valknut sign knot of fallen warriors well as the sign of odin surrounded by runes

amulet ancient asgard barbarian black celtic design edda futhark geometry gothic history illustration isolated knot logo magic medieval minimal mysterious mythology nordic norse norwegian occult odin pagan paganism pattern power rune runes sacred scandinavia scandinavian sign simple spirituality symbol tattoo three triangle trinity valhalla valknut vector viking warrior wicca