What sources, both before and after the pagan period, is the mythology derived from  that is also the mythology featured in Mats Wendt's 16 hour-long cybersyomphic work "Eddan - the invincible sword of the elf-smith"?
Mats Wendt Mats Wendt (born in 1965) is a Swedish classical composer and artist. His best known work internationally is "Eddan - the invincible sword of the elf-smith", a 16-hour-long "cybersymphonic" work on Norse mythology according to Viktor Rydberg. Five hours from "Eddan" was performed in Bayreuth 2003 during the annual Wagner festspiele, in Wahnfried, Wagner's former home, now the Richard Wagner museum.
Hortdan In Turkic mythology, Hortdan (Azerbaijanese: "Xortdan", Turkish: "Hortlak", Tuvan: "Хортан") is the troubled soul of the dead rising from the grave. Some Hortdan can be living people with certain magical properties. Some of the properties of the Hortdan include: the ability to transform into an animal, invisibility, and the propensity to drain the vitality of victims via blood loss. Hortdans are also known as immortal vampires.