Dome of Warding

This 10 ft. radius dome centered on the caster protects all of its occupants from harm. The caster cannot move without the spell failing as it is rooted to both the caster's position and it's surrounding area. The spell is also dismissed when its hit points reach 0.

This dome is transparent enough to see clearly through, although it does not provide the line of sight required for spells targeting creatures or objects on either side of the dome's walls. The dome allows sound to pass through. It also allows creatures to pass through.

The dome fails all Strength, Dexterity, and Constitution saving throws to reduce damage, it is unaffected by anything that force it to make an Intelligence, Wisdom, or Charisma saving throw.

This dome does not allow spells or weapon attacks to pass through the dome, any attack that hits the dome has its damage rolled and subtracted from the dome's hit points.

The dome's AC is 10 and has a hit point maximum of 4d12.  If there is any damage left over after after the dome's hit points reach zero the damage does not go through to anyone that was on the opposite side of its wall.

    At Higher Levels. When you cast this spell using a spell sloth of 5th level or higher, the health increases by 1d12 for each spell slot above 4th.

        (The next part is a maybe)

You can cast this spell as a reaction if you use a spell slot of 6th level or higher, but when cast this way the dome's maximum hit points cannot exceed 4d12.