Tongue of the Drowned God

You gain +1 to your AC if not wearing heavy armor. Your crystalline arm rings like a chime when hit, but it doesn't hurt.

Eldritch Words. Once per long rest, you can utter a word in a language older than Draconic. The target creature hears the sound of deep pressure and bubbles being crushed. That creature must make a Charisma saving throw or be muted for 1 minute. They can repeat the save at the end of each of their turns.