Astral Blast

You create a crackling, ethereal beam of astral energy which can shove material creatures into the astral plane temporarily and pull ethereal creatures fully into the caster's plane.  The target takes 2d8 lightning damage and must succeed on a Wisdom saving throw or be made ethereal until the beginning of your next turn.  An ethereal creature cannot affect or be affected by material objects including weapons (and magical weapons) and physical object move right through it.  The target is restrained until the etherealness wears off.

On the ethereal plane, the damage still occurs, but nothing else.  If a physical object larger than the creature is in the space where the target will reappear, the target takes 2d8 force damage and is shunted to the nearest available free space.  If the blocking object is smaller than the target, the target will appear in that square.