Psychic Binnaquid
Source Secrets of the Swarm pg. 113
Your family is among those binnaquids who learned to send telepathic messages while underwater for longer periods of time. You gain limited telepathy. You can communicate mentally with creatures within 30 feet. You can communicate only with creatures that share a language with you. This doesn't give you any access to their thoughts, and it communicates no more information than normal speech would.