SLEIPNIR Is the offspring of Loki and Svadilfari. Sleipner is Odin's eight legged steed and is the best of all horses. Odin would ride Sleipner to lead the Wild Hunt a ghostly procession of the dead through the winter sky and sometimes to the underworld. After the death of Balder, Odin lent Hermod Sleipnir so he could journey the dark horrible road to Nifilheim. Even though Sleipnir would let none other than Odin upon his back, made the exception for Hermod. Together they went to Nifilheim to meet with the goddess Hel and get her to release Balder from her realm. Sleipnir is also associated with the work of shamans that will ride spirit animals to different realms including the underworld. There are different forms of these spirit animals that shamans ride in order to cover great distances quickly. In this image Sleipner is portrayed charging through fire in the battle of Asgard at Ragnarok.
References
Skjalden.com The Nine Realms in Norse Mythology https://skjalden.com/nine-realms-in-norse-mythology/
Norse Mythology.org https://norse-mythology.org/
Myths of the Norsemen - H.A. Guerber www.doverpublications.com
The Little Giant Encyclopedia of Runes https://www.amazon.ca/Little-Giant%C2%AE-Encyclopedia-Runes/dp/0806949945
Anglo Saxon Runes https://www.arild-hauge.com/eanglor.htm
Jelling Stones, Nordic Elder and Viking Age Runes http://www.runforum.nordiska.uu.se/runecast/episode-3/
Runic Codex https://www.apmanuscripts.com/special-collection/codex-runicus
Uppsala Universitet / Institutionen för nordiska språk https://www.nordiska.uu.se/
Northern Paganism https://www.northernpaganism.org/shrines/holda/about.html
Nine Sisters https://www.northernpaganism.org/shrines/ninesisters/ran/honoring-ran.html