Biggest source of interesting things in pre-christian Scandinavia are the Icelandic Sagas, even though they were written in Christian times, they preserve a lot of the folklore and belief in magic, certain things like trolls and draugr and sometimes have pagan characters (although often as the bad guys).
You might like the Saga of Grettir the strong and should be able to find a translation. He was a really strong and kc tier guy who liked killing a lot of people. As his adventures go on, he is outlawed in more and more places and makes many enemies. One time he fights a kind of undead being and in the end his enemies hire a sorceress to carve runes that lead to his death.
A poem called Sonatorrek gives in my opinion interesting and personal insight into how a Germanic pagan person felt about his loved ones dieing. No Christian stuff here: https://en.wikipedia.org/wiki/Sonatorrek
Much younger but also interesting are folk ballads and fairy tales, that were collected all around europe after the middle ages, but often contain traces of weird folk beliefs. Nobody really knows how long these stories had been in the oral tradition.
One very famous ballad like this is the Swedish Herr Mannelig, about a troll trying to marry a christian knight, but he rejects her on the basis of religion.
Another one I like is this faroese one about a knight being invited to dance with the elves, which leads to his demise.
Many ballads like this have a strong sense of danger and magic in the natural world around the fortified settlements. Belief in such spirits of nature was especially strong in Iceland, where medieval law banned approaching the island with dragon ships as not to anger the spirits of the land and until the 20th century many people would carry rifles when travelling through the Highland, even though there are literally no dangerous animals there.