Teferi's Protection

Choose up to 10 allies within range. Until the end of your next turn you and the chosen allies vanish into the etherial plane. You can affect and be affected only by other creatures on the Ethereal Plane, and creatures on the other plane can’t perceive you unless they have a special ability that lets them perceive things on the Ethereal Plane. At the end of the spell all creatures return to an unoccupied space within 30 ft of where the left.

While in the etherial plane, creatures cannot cast spells except Abjuration spells.

While on the Etherial plane, You and the chosen allies have advantage on all checks.