The Stone of Ioun

An ancient artifact, whose origins are unknown
and mysterious. The stone of Ioun is said to be
one of the first Stones Ioun the God of knowledge
and prophecy created at the beginning of the Multiverse. Though few can say whether or not
this is true, it is known that stones that imitate
this Perfect Pearlescent Ovid Opal are sought
after on many Planes.
Once bound to Stone, your Charisma score
increases by 2, increasing your maximum by 2 to maximum of 22.