Alpha Demiplane (5e Spell)

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alpha demiplane
6th-level Conjuration
Casting time: 12 hours
Range: 200 meters (see text)
Components: V, S, M (a crystalline sphere worth in 1000gp)
Duration: permanent

you manifest in the ethereal plane using your soul to create or expand a demiplane of limited space risking your own soul.

This spell can be cast only on the Ethereal Plane. Upon casting the spell, a local density fluctuation precipitates the creation of a demiplane. At first, the fledgling plane grows at a rate of 1 foot in radius per day to an initial maximum radius of 180 feet as it rapidly draws substance from surrounding ethereal vapors and protomatter.

When the spellcaster casts this spell, every four hours you must do a DC 20 check using your spellcasting modifier. on a successful roll, nothing happens and you continue the spell. on a failed roll, the spellcaster will be unable to withstand the overload of magical power and his soul will be destroyed, killing him instantly.

In case you pass all the checks, the demiplane will be created. the demiplane will have a radius of 200 meters and can have any shape the spellcaster wishes.

Furthermore, the spellcaster decides the spellcaster decides how fast or slow time passes inside the demiplane compared to the material plane. the spellcaster can make time pass 4 times faster or slower within the plane. For example, if the spellcaster wants time to go 4 times slower inside the demiplane compared to the material plane, 1 day on the demiplane would be equivalent to 6 hours on the material plane, and if the spellcaster decides to set the time 4 times faster within the demiplane, 1 day in the demiplane would be equivalent to 4 days in the material plane.

The spellcaster determines the environment within the demiplane when they first cast alpha demiplane, reflecting most any desire the spellcaster can visualize. The spellcaster determines factors such as atmosphere, water, temperature, and the general shape of the terrain. The spellcaster can also create animals and non-magical vegetation within the demiplenum as part of the creation, and can also create basic structures that must be made of wood, stone or simple metals. The spellcaster must add these things in some other fashion if they desire such. Once the basic demiplane reaches its maximum size, the spellcaster can continue to cast this spell to enlarge the demiplane, adding another 200 meter radius to the demiplane each time.

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