Armor Gem

This fist-sized glass ruby can be connected to a set of armor by spending 10 minutes meditating on the two objects and finishing it by reciting its command phrase. Once connected, the Ruby will be embedded in the chest piece of the armor.

You can use an action to touch the ruby, and the suit of armor that will be absorbed into it. 

While the armor is in the ruby, a metal chain will wrap around your neck, keeping the Ruby hanging like an amulet around your neck. While the armor is in the ruby you do not gave any of the benefits of the armor. 

You may use another action to touch the ruby and have the armor magically reform around your body.

You make remove the ruby by spending an action to recite the phrase again.

Notes: Command phrase: Ulnaus, PC with proficiency in at least one kind of Armor