You create a demiplane centered on yourself. This demiplane is both defensive and offensive. To the outside world, this area looks like reflective circular orb. Every creature of the caster's choice in the radius when this spell is first cast is enveloped into the demiplane. If a creature from the outside attempts to they must make a Constitution Saving Throw against your Spell Save DC or be thrown back 50 feet and knocked prone. If a creature is on the inside, they can attempt to esacpe the demiplane, by reaching the edge of the demiplane and succeeding on a Constitution saving throw against your Spell Save DC. On a failure, the started takes 10d6 force damage and is blown back 50 feet prone.
The demiplane looks like however you like. You control the environment and you can choose whether or not to harm any creature in the demiplane. Any spell that requires a saving throw to avoid half damage, foregoes this saving throw and inflicts full damage.
When you first cast the spell you can choose three of the following effects
-Spells cost one less level to cast
-You can make the demiplane difficult terrain.
-You have the effect of the Fly spell while in your demiplane
-You can concentrate on one additional concentration spell while in your demiplane.
If two beings cast Domain Expansion in the same area. The two beings must make contested spell casting modifier checks to see who's remains.
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