Domain Expansion
9th-level Conjuration (Sorcerers, Wizards, Warlocks)
Casting Time: 1 action
Range: 30 feet
Components: V, S
Duration: 1 minute, concentration
You create a 30 foot radius sphere shaped demiplane centered on yourself in reality. This demiplane is both offensive as well as defensive, creating a solid barrier that prevents any matter from passing through it and blocking any spells cast into or out from the area. To the outside world this area looks like a grayish black smoke. A creature from the outside can enter as normal.
The demiplane looks however you like, and you can control the environment along with any effects of your choosing within its borders, turning them off and on as a free action on each of your turns. When you cast the spell, any creature that is completely inside the demiplane area is trapped. Creatures only partially within the area, or those too large to fit inside the area, are pushed away from the center of the area until they are completely outside the area.
A creature inside the demiplane can’t leave it by nonmagical means. If the creature tries to use teleportation or interplanar travel to leave the demiplane, it must first make a Charisma saving throw. On a success, the creature can use that magic to exit the demiplane. On a failure, the creature can’t exit the demiplane and wastes the use of the spell or effect. The demiplane also extends into the Ethereal Plane, blocking ethereal travel.
When you cast this spell, choose one major, and three minor effects to imbue into your demiplane. These effects end as soon as you exit your demiplane.
Major Effects:
- Creatures of your choice within the demiplane gain a 1d12 to attack rolls and saving throws. When you take this effect, you cannot also take the bless spell minor effect.
- Spells you cast cost one less level to cast, and 1st level spells become cantrips while you’re within your domain.
- On the start of a creatures turn, creatures within your demiplane must make a dexterity saving throw. Taking 6d12 slashing damage on a failed save, or half as much on a successful one.
- When a creature you aren’t physically touching first enters the demiplane, they must make an intelligence saving throw. On a failure, they are stunned for 1d4+1 rounds. A creature stunned in this way takes 4d12 psychic damage at the start of each of their turns.
Minor Effects:
- You can make the area of your domain difficult terrain
- No creature can enter your domain.
- This demiplanes range is instead expanded to a 60 foot radius.
- Name one spell of 8th level or lower, that spell cannot be cast while within your demiplane.
- You can heal yourself and creatures of your choice that you can see for 10 hit points at the start of your turn while within your demiplane.
- You can concentrate on an additional spell of 7th level or lower, while within your demiplane
- You have the effects of the Fly spell while within your demiplane
- Creatures hostile to you within the demiplane are under the effects of the bane spell.
- Creatures friendly to you within the demiplane are under the effects of the bless spell.
- Critical hits against yourself or your allies are treated as normal from enemies hostile to you.
This spell can’t be dispelled by dispel magic. If there are no creatures hostile to you within your demiplane, then the demiplane automatically dispels. If another creature casts Domain Expansion with an overlapping sphere to yours, you enter a domain clash. The caster with the highest spell save DC has their domain overtake the others, ending the weaker domains effects.
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