World of Dragon Series, #4: Norse Dragon.  Nidhoggr, part dragon part serpent, lived in the darkest whirlpool of the underworld, Hel, gnawing on the Yggdrasil, theTree of Life, which held the nine Nordic worlds together.  Each 1 ounce copper round, enclosed a clear protective hard plastic case, comes in a velour pouch with up to 8 Scandanavian coins of various dates and denominations.