Collar of Silence

A Collar of Silence is a magic item that negates the wearer's ability to speak.

Description
A creature can attempt to force the collar around the neck of another creature by grappling them. The collar locks around the creature's neck once donned. The collar must then be activated by making an Intelligence (Arcana) check. Once activated, the creature wearing the collar is unable to speak, and can't cast spells with Verbal components. The collar can be unlocked using thieves' tools, but is difficult

History
While exploring the Folding Halls of Halas to rescue Yussa Errenis, the Mighty Nein encountered a mage-hunter golem that guards the Halls. The golem could clamp these collars around the necks of intruders to nullify much of their spellcasting abilities, and did so against Caleb. The collar was able to be removed, and he kept it.

Caleb found that the collar was rendered inert after being removed from him, and determined that he would need an arcane cortex from one of the golems of Aeor to recharge it. While exploring one of the ruins in Eiselcross, the party encountered such a golem, and Caleb was able to remove the cortex. He would then use it to recharge the collar.

When Trent Ikithon confronted the party at the Blooming Grove, Beau, having been given the collar, managed to grapple the collar onto his his neck. Astrid, turning on her master, activated the collar.