Hreidmar's three sons were Ótr, Fáfnir, and Regin. Loki killed Ótr in his otter form, and the cursed wergild gold drove Fáfnir to murder Hreidmar and become a dragon.
Loki killed Ótr with a stone while Ótr was fishing in otter form at Andvari's waterfall. This act triggered the demand for cursed gold as weregild.
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