Seamless Space (5e Spell)

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Seamless Space
5th-level Transmutation
Casting time: 1 action
Range: Touch
Components: V, S, M (a topaz and a sapphire each worth at least 250 gp)
Duration: Up to 24 hours, or until dispelled.

You touch an enclosed aperture or flat surface no larger than a 10-foot square, then select another enclosed aperture or flat surface of matching dimensions within the range of your vision. Space separates, twists, and reconnects as the two chosen points become seamlessly connected.

Creatures, objects, spells, effects, etc. can traverse through one point and out of the another without being affected in any way, or even noticing anything immediately amiss. However, observant creatures can make a Intelligence (Investigation) check to determine the existence of this spacial rift, with the DC being set at 15 but adjustable depending on how jarring the immediate transition between the two locations is (for example, the stone walls and floor of a cave being abruptly cut off in place of the wood floor and brick walls of a house would be lower, while one dungeon corridor connected in space to an identical dungeon corridor would be immensely higher).

The two connected points are not single sided. This is most easily apparent when this spell is cast on an aperture. Take for example, a house with a living room, a bedroom, and an entrance. The entrance and bedroom doorways become connected with seamless space, so when a creature enters the house from outside, they would find themselves the bedroom instead of the living room. However, if a creature is inside the living room and they attempt to enter the bedroom, they would instead walk back into the living room through the doorway of the entrance. Being that the living room has no other exits besides the two doorways, this means that the creature becomes essentially trapped in an endless loop of the same room repeating over and over. At least until the spell expires or it hacks its way through the wall of the house. Although, this is not the only configuration the spell can take. When the spell is cast, the caster can decide the orientation of how the two points connect to each other. Thus, the outside entrance could take you into the living room, but from the bedroom doorway, while the doorway out of the living room that would normally be connected to the entrance takes you to the bedroom.

The spell ends early if you dismiss it as a bonus action, or if the material of the surface or aperture of either point is removed to a point where the connected space is rendered larger than its maximum dimensions (a 10-foot square).

When the spell is cast or when it ends, any creature standing on the line where the points connect must make a DC 20 Dexterity saving throw to avoid being partially or even fully dismembered by the creation or collapse of the spacial connection. Failure on the save results in 6d10 force damage being taken. If the creature has a size that takes up an area equal to or larger than the connecting area of the spell, it has disadvantage on the Dexterity saving throw.

The seamless space can be made permanent by casting this spell once in the same location every day for one year. Once permanent, the tunnel in space becomes self-sustaining and no longer requires magic to function. This means that nothing short of expanding it past its maximum dimensions or a wish spell can dispel it.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the maximum dimensions of the connected space increases by 5 feet for every spell slot above 6th.

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