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Demiplane

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Demiplane
  • Level: 8
  • School: Conjuration
  • Class: Sorcerer, Warlock, Wizard
  • Casting Time: Action
  • Range: 60 feet
  • Components: S
  • Duration: 1 hour

You create a shadowy door on a flat solid surface that you can see within range. The door is large enough to allow Medium creatures to pass through unhindered. When opened, the door leads to a demiplane that appears to be an empty room 30 feet in each dimension, made of wood or stone. When the spell ends, the door disappears, and any creatures or objects inside the demiplane remain trapped there, as the door also disappears from the other side.

Each time you cast this spell, you can create a new demiplane, or have the shadowy door connect to a demiplane you created with a previous casting of this spell. Additionally, if you know the nature and contents of a demiplane created by a casting of this spell by another creature, you can have the shadowy door connect to its demiplane instead.

Tactical Usage​

Private Sanctuary: Demiplane creates an isolated extradimensional space for storage, rest, or secure meetings. This 8th-level conjuration spell excels at providing absolute safety and unlimited storage capacity.

Optimal Timing: Deploy for long rest safety, treasure storage, emergency retreat, or when requiring secure planning space away from all threats.

Resource Management: Uses an 8th-level spell slot - available from character level 15+. 1-hour duration provides substantial sanctuary time.

Target Selection: Self-targeting opens portal to 30-foot chamber. Subsequent castings can expand existing demiplane.

Spell Combinations​

Synergistic Spells:

  • Transportation Magic: Combine with teleport or plane shift for rapid demiplane access
  • Storage Magic: Layer with magnificent mansion for comprehensive shelter options
  • Security Magic: Pair with alarm or glyph of warding to protect demiplane entrances

Class Feature Interactions:

  • Ritual Casting: Some classes can cast this without expending spell slots (if available)
  • Planar Magic: Features that enhance dimensional magic improve demiplane capabilities
  • Storage Mastery: Abilities that manage equipment benefit from unlimited storage

Multi-Caster Coordination: Multiple casters can create networked demiplanes or share access to existing spaces.

Material Component Details​

Component Acquisition: Forked metal rod worth at least 500 gp, attuned to specific plane of existence.

Component Handling: Expensive focus requirement. Rod must be crafted or purchased from planar specialists.

Roleplay Opportunities: Rod design reflects planar attunement, magical traditions, or personal dimensional aesthetics.

Economic Considerations: High initial investment but provides permanent extradimensional space with successive castings.

Creator Notes​

Encounter Balancing: Absolute safety zone dramatically affects resource management and story pacing.

NPC Usage: Archmages, powerful wizards, or planar specialists might maintain private demiplanes for research or storage.

Environmental Considerations: 30-foot chamber with breathable air, normal temperature, and dim illumination.

Campaign Integration: Ultimate utility magic that can fundamentally change party resource management and campaign logistics.

Environmental Interactions​

Terrain Effects: Extradimensional space unaffected by material plane environmental conditions.

Weather Influence: Demiplane maintains stable environment regardless of external weather.

Structural Interactions: Portal can be opened anywhere with sufficient space. Demiplane exists independently.

Elemental Interactions: Controlled environment immune to elemental hazards or hostile conditions.

Common Rulings & Clarifications​

Timing Questions: Action casting time with 1-hour duration. Portal closes after duration expires.

Target Limitations: Self-targeting creates personal demiplane. Up to eight creatures can enter through portal.

Duration Interactions: 1-hour access window. Subsequent castings can access same demiplane or expand it.

Mechanical Interactions: Each casting adds 30 feet to one dimension. Creatures inside when spell ends are expelled.

Alternative Applications​

Non-Combat Uses: Treasure vault, research laboratory, safe meeting space, or emergency shelter.

Social Encounters: Private negotiations, secret planning sessions, or demonstrations of ultimate magical power.

Exploration Applications: Base camp establishment, equipment storage, or secure rest location.

Utility Functions: Mobile headquarters, magical laboratory, treasure repository, or planar research facility.

Same School: Other conjuration spells like rope trick (2nd level temporary hideout), magnificent mansion (7th level magical dwelling), gate (9th level planar portal).

Similar Effects: rope trick (2nd level small hideout), magnificent mansion (7th level furnished home), demiplane (8th level personal dimension).

Progression Options: rope trick (2nd level basic hiding), magnificent mansion (7th level luxury shelter), demiplane (8th level permanent space).

Complementary Magic: teleport (rapid travel to demiplane), plane shift (planar navigation), magnificent mansion (additional shelter options).

Scaling Analysis​

Level Progression: Ultimate utility for high-level campaigns (15+) where security and storage become paramount.

Upcast Benefits: 9th-level casting creates permanent demiplane that doesn't require subsequent spell slots.

Campaign Phases: Most valuable in late-game where parties accumulate significant treasures and need absolute security.

Comparative Value: Exceptional utility magic that justifies 8th-level slot for game-changing dimensional access.

Narrative Flavor​

Casting Description: Reality tears open as you create a doorway to your personal pocket dimension, revealing a chamber that exists outside normal space.

Effect Manifestation: A shimmering portal appears, leading to a comfortable chamber that serves as your private extradimensional sanctum.

Personal Style: Wizards create precisely calculated dimensional mathematics, while sorcerers manifest intuitive personal realms reflecting their inner nature.

World Integration: Represents mastery of dimensional magic available only to arcane masters, often associated with archmages, planar scholars, or those who transcend normal magical limitations.