Division Seal

You call forth a semi-transparent, nigh-impenetrable barrier, which envelops a 30 ft. Sphere within range.

Nothing can move into or out of the area within the barrier, nor can anything teleport into or out of it. Nothing inside the area can affect anything outside of it, and vice versa.

Almost-Indestructible. For 1 minute after you cast this spell, the barrier can potentially be destroyed. The barrier has AC 20, 200 Hit Points, and regains 50 Hit Points at the start of each of your turns. After this time, the barrier solidifies, becomes opaque, and gains Immunity to all damage - the barrier can then be destroyed only by the Disintegrate spell, or similar magic.