Arcane Shield

You create a 5-radius-dome of magic forms around you with you as its center point. The spell ends when it runs out of hit points or you leave the area.

Medium creatures up to your spell-casting modifier that you choose can be in the dome under its protection. The dome has 8d6 hit points with a AC of your spell DC. Any creature and object that isn't wanted in the dome is barred from entering. Spells and other magical effects cannot enter either or affect any creature inside the dome.

The dome is opaque on the outside of any color you choose, but it is transparent from the inside.

At higher levels: the dome gains an extra 1d6 hit points for each spell slot above 3.