As translated from Kingdom of Dericost records:

Aesir and Vanir had never gotten along to well. Although both were still young Vanir was quite adept at Golem making while Aesir was proving to be a skilled warrior. Vanir used the clay of the Great River and a mix of beach sand for his fighting Golems. They were quite formidable in their matches, which was a common pastime of the young and old during this time. Vanir was as well know for his Golems, as Aesir was for his skill with melee weapons.

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