Avronin's Astral Assembly

You alert a number of creatures that you are familiar with,
up to your spellcasting ability modifier (minimum of 1), of
your intent to communicate with them through spiritual
projection. The invitation can extend any distance and
even cross to other planes of existence. Once notified, the
creatures can choose to accept this communication at any
time during the duration of the spell.
When a creature accepts, its spirit is projected into
one of the gems used in casting the spell. The material
body it leaves behind falls unconscious and doesn’t need food or air. The creature’s consciousness is present in the
room with you, and its normal form appears as an astral
projection within 5 feet of the gem its spirit occupies. You
can see and hear all the creatures who have joined in the
assembly, and they can see and hear you and each other as
if they were present (which they are, astrally). They can’t
interact with anything physically.
A creature can end the spell’s effect on itself voluntarily
at any time, as can you. When the effect ends or the
duration expires, a creature’s spirit returns to its body,
and it regains consciousness. A creature that withdraws
voluntarily from the assembly can’t rejoin it even if the
spell is still active. If a gem is broken while occupied by
a creature’s astral self, the spirit in the gem returns to its
body and the creature suffers two levels of exhaustion.