rituals, runes, mounds, tools and etc
https://uu.diva-portal.org/smash/get/diva2:1221652/FULLTEXT01.pdf
the same symbols can be found in both sweden and spain from various petroglyphs dating back 2500 years ago with what has been interpreted as sailors transporting some sort of cow whilst theyre doing acrobatics over the animal

bohuslän; (like in picture references)
https://upload.wikimedia.org/wikipedia/commons/f/fd/Kart_over_Viken.png
https://sv.wikipedia.org/wiki/Vaner

the most likely origins of "álfr" & beowulf in between sweden & norway by Sweden's west coast and Alvhem is also known for the Jätteberget petroglyphs
http://wadbring.com/historia/undersidor/jatteberget.htm

Boguslav is also a location in Ukraine, rough translations in russian can be surprising but most likely just a coincidence