The Summoning of Susano

[Anonymoose]

The points in above posts are what make it so difficult.

The journal says he is a primal, implying this just a deiform wearing a kami's visage.

Unfortunately, for reasons beyond your knowing, two of the sacred treasures stored in the isle's vault “reacted” to the presence of the Yasakani–no–Magatama, summoning forth from the aether the great kami Susano─a primal by another name.

And while the above says that the Magatami did this on its own (SOMEHOW), Triple Triad also says the Kojin summoned Susano at some point.

A deity summoned forth by the Kojin, Susano resided in three sacred receptacles. As well as being one of the greatest kami, this entity is also revered as the god of the sea. The Lord of the Revel rejoices in both battle and banquet, meeting all challengers with jubilant and unrestrained ferocity.