Demiplane

Source: Dungeon Master’s Guide (2024), page 340. Creator: Wizards of the Coast / D&D Studio.

Quick Reference

Field	Value
Facility type	special
Required level	17
Space	vast
Hirelings	1
Bastion order	empower
Prerequisite	Ability to use a listed spellcasting focus: arcane, tool.

Rules Text

A door up to 5 feet wide and 10 feet tall appears on a flat, solid surface in one of the other facilities in your Bastion. You choose the location. If you are in your Bastion during a Bastion turn, you can relocate this door to another facility in your Bastion.

Only you and your Bastion’s hirelings can open the door, which leads to a Demiplane that takes the form of a stone room. The Demiplane exists in an extradimensional space and therefore isn’t attached physically to other locations in your Bastion. Neither the Demiplane nor its door can be dispelled.

Empower: Arcane Resilience

When you issue the Empower order to this facility, magical runes appear on the Demiplane’s walls and last for 7 days. Until the runes disappear, you gain Temporary Hit Points equal to five times your level after spending an entire Long Rest in the Demiplane.

Fabrication

While in the Demiplane, you can take a {@action Magic|XPHB action to create a nonmagical object of your choice from nothing, causing it to appear in an unoccupied space in the Demiplane. The object can be no bigger than 5 feet in any dimension; can’t have a value over 5 GP; and must be made of wood, stone, clay, porcelain, glass, paper, nonprecious crystal, or nonprecious metal. You must finish a Long Rest before you can take this action again.

Balance Notes

• Compare this facility against other 17-level facilities before allowing homebrew upgrades.
• Keep the listed Bastion order as the primary action loop; additional benefits should usually be narrative, temporary, or gated by downtime.
• If this facility grants creatures, information, resources, crafted items, or empowerment, keep those outputs tied to Bastion turns rather than free adventuring actions.

Links

• Parent index: Bastions Index
• Source index: 00 - Dungeon Masters Guide 2024 Index