Wondrous Item

Uncommon requires attunement by a creature with an intelligence score of 3 or higher Requires Attunement

This crystal grants you telepathy for as long as you remain attuned to it. See the introduction of the Monster Manual for rules on how this telepathy works.   The crystal also glows with a purplish inner light while you are attuned to it.   The higher your intelligence, the greater the light's intensity and the greater the range of the telepathy (see the Psi Crystal Properties table below).  

Intelligence Score	Range of Telepathy	Light Intensity
3-7	15 feet	Dim light out to a range of 5 feet
8-11	30 feet	Bright light in a 5-foot radius and dim light for an additional 5 feet
12-15	60 feet	Bright light in a 10-foot radius and dim light for an additional 10 feet
16 or higher	120 feet	Bright light in a 15-foot radius and dim light for an additional 15 feet