Yaso Magatsuhi is a figure in Shintoism from the Kojiki. After Izanagi returns from Yomi, he bathes to rid himself of the impurities accumulated in Yomi. The impurities from his body turn into two gods, Yasomagatsuhi-no-kami and Ōmagatsuhi-no-kami. The two are associated with misfortune, calamity, disaster, and ruin.[1][2]
Yaso Magatsuhi no Kami is the deification of the sources of disaster: impurity, ill fortune, miser, evil, etc...
After his return from Yomi, the land of the dead, Izanagi performed a ritual purification to wash the filth of death from himself. Two gods were born from the cast-off filth, one of which was Yaso Magatsuhi.