Question: 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"?
Context: Norse mythology is the body of mythology of the North Germanic people stemming from Norse paganism and continuing after the Christianization of Scandinavia and into the Scandinavian folklore of the modern period.  The northernmost extension of Germanic mythology, Norse mythology consists of tales of various deities, beings, and heroes derived from numerous sources from both before and after the pagan period, including medieval manuscripts, archaeological representations, and folk tradition. The list of Lithuanian gods is reconstructed based on scarce written sources and late folklore.  Lithuania converted to Christianity in 1387, but elements of Lithuanian mythology survived into the 19th century.  The earliest written sources, authored by foreigners and Christians, only briefly mention the Lithuanian gods.  Beginning in the 16th century, the pagan religion received more attention from authors, but often their accounts were confused, contradictory, and heavily influenced by various religious agendas.  Collection and recording of folklore began in the 19th century, by which time the pagan mythology had become fragmented and mixed with Christian traditions.  The cults of old deities transformed into folklore (individual tales, myths, songs, etc.) without associated rituals.  Because of such difficulties obtaining data, there is no accepted list of Lithuanian gods.  Different authors present wildly contradictory reconstructions of the Lithuanian pantheon. 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. The Kingdom of Pagan (Burmese: ပုဂံခေတ် , ] , lit.  "Pagan Period"; also commonly known as the Pagan Dynasty and the Pagan Empire) was the first kingdom to unify the regions that would later constitute modern-day Burma (Myanmar).  Pagan's 250-year rule over the Irrawaddy valley and its periphery laid the foundation for the ascent of Burmese language and culture, the spread of Burman ethnicity in Upper Burma, and the growth of Theravada Buddhism in Burma and in mainland Southeast Asia. Baltic mythology is the body of mythology of the Baltic people stemming from Baltic paganism and continuing after Christianization and into Baltic folklore.  Baltic mythology ultimately stems from Proto-Indo-European mythology.  The Baltic region was one of the last regions of Europe to be Christianized, a process that occurred from the 15th century and into at least a century after.  While no native texts survive detailing the mythology of the Baltic peoples during the pagan period, knowledge of the mythology may be gained from Russian and German chronicles, later folklore, by way of etymology, and comparative mythology. Graveland are a Polish pagan metal band which was formed in 1992 by Rob Darken (born Robert Fudali).  It began as a black metal band, before adopting a pagan and Viking metal style.  The lyrics and imagery of Graveland are strongly inspired by European mythology, nature, winter and war.  Their early work focused on Celtic and Slavic mythology, while their later work focuses on Norse mythology and Wotanism. Maher or Mahrem is a god of the Aksumites and the Himyarites.  Son of main god Ashtar, and his counterpart Beher, god of the sea, he was the deity of war, compared with Mars or Ares in Classical sources who used both forms of the interpretatio.  The God "Maher" (or Mahrem) held a place of special importance with the Axumites; the gods of the pagan period were all called the Sons of the Invincible Mahrem. Taken is a Franco-American drama series based on the "Taken" film trilogy.  The series acts as a modern day origin story.  Clive Standen stars as a younger version of Bryan Mills, the character played by Liam Neeson in the trilogy.  The series was commissioned with a straight-to-series-order in September 2015.  The series premiered on February 27, 2017, on NBC.  NBC renewed the series for a second season and extended the number of episodes from 10 to 16 hour-long episodes on May 9, 2017. . Tilman Frasch is a historian working at Manchester Metropolitan University.  He is a leading expert in Burmese historical sources of the Pagan period.  Frasch received his PhD in Heidelberg in 1994 with a work about the Pagan kingdom, titled "Pagan: Stadt und Staat. Ravananugraha or Ravananugraha-murti ("form showing favour to Ravana") is a benevolent aspect of the Hindu god Shiva, depicted seated on his abode Mount Kailash with his consort Parvati, while the "rakshasa"-king (demon-king) Ravana of Lanka tries to shake it.  The depiction is labelled variously as Ravana Lifting Mount Kailash or Ravana Shaking Mount Kailash.  According to Hindu scriptures, Ravana once tried to lift Mount Kailash, but Shiva pushed the mountain into place and trapped Ravana beneath it.  For a thousand years, the imprisoned Ravana sang hymns in praise of Shiva, who finally blessed him and granted him an invincible sword or a powerful linga (Shiva's aniconic symbol) to worship.
Answer: medieval manuscripts, archaeological representations, and folk tradition