Mantle stone of Vhyridaan

The mantle stone of Vhyridaan was an ioun stone that held and protected against magical spells. It was associated with Vhyridaan.

Powers
The mantle stone of Vhyridaan functioned similarly to a vibrant-purple prism ioun stone: it could be used to store spells like a ring of spell storing.

In addition, thrice a day, the bearer could utter a command word and the stone would protect them from spells, or even turn them back on their caster, similar to the spell turning spell.