Lords of Fluviallis
Guardians of the Gates
What you know:
Fey Lords created the Gate of Endless Worlds on Golarion because the primal magic of the First World was too dangerous and unstable. After exploring, they decided that things that lay beyond some of the gates (in the Dark Tapestry) were too dangerous and the gate was no longer used. They sealed the gate by each court appointing a guardian to prevent its use. Summer appointed Mish’ruu the Feathered Rainbow to stop traffic from Golarion through the gates. Shadow Court appointed a guardian to prevent the gates from being activated. Winter Court appointed Kintaro the Great Serpent to stop traffic through the gates from beyond. He is by far the most powerful of the three guardians.
Drakkus knows through his Knowledge(Arcane) that the serpent possess powers of disjunction, the ability to dispel a magical connections or effects. The violet gem in the ring of wizardry is hardened precipitation from his scales left behind by dispelling powerful wards. In the case of your ring, The Black Watcher in Silence a being from the Dark Tapestry, attempted to bring an army through the gate many millenia ago, and were disjuncted.