The most difficult nordic mythol­o­gy riddles

In Norse mythology, Garmr or Garm is a wolf or dog associated with both Hel and Ragnarök, and described as a blood-stained guardian of Hell's gate.

In addition to racing over the ground, Odin’s mighty steed can also fly through the air and swim through water. None of the elements slow him down. Famously, he is even able to ferry Odin safely in and out of Hel, the realm of the dead.

According to Norse Mythology, Odin hang himself for nine days on the tree called Yggdrasil.

In Norse mythology, Midgardsorm (Jörmungandr) is a sea serpent. The serpent grew so large that he was able to surround the earth and grasp his own tail. As a result, he received the name of the Midgard Serpent or World Serpent. When he releases his tail, Ragnarök will begin. Thor will eventually kill Jörmungandr but will fall dead after walking nine paces, having been poisoned by the serpent's deadly venom.

The magic spear of Odin - Gungnir, always hit the target and killed the victim.

Niflheim is in Norse mythology, the cold, dark, misty world of the dead, ruled by the goddess Hel. In some accounts it was the last of nine worlds, a place into which evil men passed after reaching the region of death (Hel). Situated below one of the roots of the world tree, Yggdrasill, Niflheim contained a well, Hvergelmir, from which many rivers flowed.

In Nordic mythology, Mjölnir is the hammer of Thor, the god of thunder and lightning. The hammer was forged by dwarfs named Sindri and Brokk. The meaning of the word Mjölnir is usually translated as "the one who crushes". Another theory combines this name with lightning.