This pale turquoise amulet seems to have a faint flicker of
something moving in it, like seeing a creature in murky
waters. While wearing this amulet, you gain telepathy out
to a range of 120 ft., can understand and speak Deep
Speech, and become proficient in Intelligence (History)
checks if you weren’t proficient already.
You may also spend an action to target one creature you
can see within 30 feet of you. That target must succeed on
a DC 14 Wisdom saving throw or be magically charmed by
you. This charm persists until either you or the target dies,
or if you are on different planes of existence. You and the
charmed target may communicate with each other
telepathically over any distance so long as you are wearing
and attuned to this item.
You may only have up to 3 targets charmed in this way at
a time. If you successfully charm another target while you
already have 3 targets charmed, the charm effect ends on
the creature that you charmed first. Whenever the charmed
target takes damage, they may repeat the saving throw. On
a success, the effect ends. No more than once every 24
hours, the target can also repeat the saving throw when it
is at least 1 mile away from you. If a creature succeeds on
either resisting the charm effect or if the charm effect on
them ends, they become immune to this ability for the next
24 hours.

Notes: Language: Telepathy, Language: Deep Speech, Proficiency: History, Charmed, Requires a long rest to attune, or, short rest if you have proficiency in intelligence savings throws.