Valkyries

The Valkyries are a group of female warriors in Norse mythology who bring those that have fallen in battle to Valhalla.

After Jack defeated The Lava Monster and freed him of his curse, he died of old age. His soul was taken by the Valkyries to Valhalla.

Trivia
Their role of escorting spirits of the deceased is similar to the angels in Abrahamic faiths (Judaism, Christianity and Islam).