The Relic "Grasp of Yemen" pictured below does not correctly grant AC and does not require being worn to cast spells.
Relic
(https://cdn.discordapp.com/attachments/862302308582555669/934633385450680330/unknown.png)
Base AC
(https://cdn.discordapp.com/attachments/862302308582555669/934633578648727572/unknown.png)
AC with relic
(https://cdn.discordapp.com/attachments/862302308582555669/934633635854843925/unknown.png)
AC with Magic Vest
(https://cdn.discordapp.com/attachments/862302308582555669/934633795729109042/unknown.png)
AC with Magic Vest and Relic
(https://cdn.discordapp.com/attachments/862302308582555669/934633854361280512/unknown.png)
Status symbol when wearing relic
(https://cdn.discordapp.com/attachments/862302308582555669/934633705090195456/unknown.png)
Bracers of armor give armor AC, as in the same AC that the spell Mage Armor gives. Its meant to grant you 1 ac if you're wearing cloth armor. Odd that its allowing you to cast without being equipped though. That part is most likely a bug.