Hel is one of the nine worlds of Norse mythology. It is where the mortal dead gather after life if their death was dishonourable. Its ruler is the goddessHel. Hel is located under the roots of the treeYggdrasil. It can be reached via the riverGjöll. A bridge spans this river which is guarded by the giantess Modgrudr. Garm, a dog, guards the entrance to the castle of Hel. He only lets the dead souls enter however they cannot leave. A rooster is the companion of Garm. Its purpose in the realm of the gods is to wake them for Ragnarök, this rooster will also wake the souls of the dead.