Dungeons and Dragons – Mystara
Magical Item – Daern’s Instant Fortress
- Type: Wondrous Item
- Rarity: Rare, Gnomish Relic
- Original Source: Dungeons Master’s Guide (dmg160)
- Base Item
- Campaign Examples
- Original Item
- Content Updates

Base Item – Daern’s Instant Fortress
Rare Item Value
Price: 2d10 x1,000 gp (2,000 to 20,000) – 50% for consumable items
Base Price: 12,000 gp or 6,000 gp for expendable
Expendable Items can be attuned on use, at the cost of a random attuned item and slot.
Cursed Items auto attune on use and replace a random attuned item and slot.
Magical Items – C – Common, U – Uncommon, R – Rare, VR – Very Rare, L – Legendary, A – Artefact, Cu – Cursed
Racial Items Link – Dragonkind, Dwarven, Elven, Genasi, Giant, Gnome, Halfling, Human
- Magical Items – Rare – Daern’s Instant Fortress – 12,000 gp
- Standard: You can use an action to place this l-inch metal cube on the ground and speak its command word. The cube rapidly grows into a fortress that remains until you use an action to speak the command word that dismisses it, which works only if the fortress is empty.
- The fortress is a square tower, 20 feet on a side and 30 feet high, with arrow slits on all sides and a battlement atop it. Its interior is divided into two floors, with a ladder running along one wall to connect them. The ladder ends at a trapdoor leading to the roof. When activated, the tower has a small door on the side facing you. The door opens only at your command, which you can speak as a bonus action. It is immune to the knock spell and similar magic, such as that of a chime of opening.
- Each creature in the area where the fortress appears must make a DC 15 Dexterity saving throw, taking 10d10 bludgeoning damage on a failed save, or half as much damage on a successful one. In either case, the creature is pushed to an unoccupied space outside but next to the fortress. Objects in the area that aren’t being worn or carried take this damage and are pushed automatically.
- The tower is made of adamantine, and its magic prevents it from being tipped over. The roof, the door, and the walls each have 100 hit points, immunity to damage from non-magical weapons excluding siege weapons, and resistance to all other damage. Only a wish spell can repair the fortress (this use of the spell counts as replicating a spell of 8th level or lower). Each casting of wish causes the roof, the door, or one wall to regain 50 hit points.
- Attunement: While attuned to this item, its activation shows your heraldry on the outside. When you take a long rest while attuned and it is not activated, it recovers a number of hit points equal to your total hit dice remaining at the start of your long rest, while also consuming those dice which you don’t recover from the rest. This means you can only heal the fortress once per two days.
- Relic: A gnome who uses this item can choose to split the inside into three levels instead, making it uncomfortable for medium sized creatures, but plenty of room for small creatures.
Example Campaign Items – Daern’s Instant Fortress
Original Item – Daern’s Instant Fortress
Source: Dungeons Master’s Guide (dmg160)
DAERN’S INSTANT FORTRESS
Wondrous item, rare
You can use an action to place this l-inch metal cube on the ground and speak its command word. The cube rapidly grows into a fortress that remains until you use an action to speak the command word that dismisses it, which works only if the fortress is empty.
The fortress is a square tower, 20 feet on a side and 30 feet high, with arrow slits on all sides and a battlement atop it. Its interior is divided into two floors, with a ladder running along one wall to connect them. The ladder ends at a trapdoor leading to the roof. When activated, the tower has a small door on the side facing you. The door opens only at your command, which you can speak as a bonus action. It is immune to the knock spell and similar magic, such as that of a chime of opening.
Each creature in the area where the fortress appears must make a DC 15 Dexterity saving throw, taking 10d10 bludgeoning damage on a failed save, or half as much damage on a successful one. In either case, the creature is pushed to an unoccupied space outside but next to the fortress. Objects in the area that aren’t being worn or carried take this damage and are pushed automatically.
The tower is made of adamantine, and its magic prevents it from being tipped over. The roof, the door, and the walls each have 100 hit points, immunity to damage from non-magical weapons excluding siege weapons, and resistance to all other damage. Only a wish spell can repair the fortress (this use of the spell counts as replicating a spell of 8th level or lower). Each casting of wish causes the roof, the door, or one wall to regain 50 hit points.
Content Updates
Magical Items
Magical Items in Mystara Overview, Campaign Items, Creating Unique Items
Downtime Buying and Selling Items or Crafting Items
Types: Armour, Blessings, Books, Charm, Epic Boons, Marks of Prestige, Potion, Ring, Rod, Rune, Scroll, Staff, Wand Overview, Weapon, Wondrous Items
Relics of: Dragonkind, Dwarves, Elven, Genasi, Giantkind, Gnome, Halfling, Human
Tuesday Items: T001, T002, T003, T004, T005, T006, T007, T008, T009, T010, T011, T012, T013, T014, T015, T016, T017, T018, T019, T020, T021, T022, T023, T024, T025, T026, T027, T028, T029, T030, T031, T032, T033, T034, T035, T036, T037, T038, T039, T040, T041, T042, T043, T044, T045, T046, T047, T048, T049, T050, T051, T052, T054, T055, T056, T057, T058, T059, T060, T061, T062, T063, T064, T065, T066, T067, T068, T069, T070, T071, T072, T073, T074, T075
Wednesday Items: W001, W002, W003, W004, W005, W006, W007, W008, W009, W010, W011, W012, W013, W014, W015, W016, W017, W018, W019, W020, W021, W023, W024, W027, W028, W029, W030, W031, W032, W033, W034, W035, W038, W039, W040, W041, W042, W043, W044, W045, W047, W048, W049, W050, W051, W052, W054, W055, W056, W058, W059, W061, W062, W063, W064, W065
Friday Items: F002, F005, F006, F007, F008, F009, F010, F012, F014, F016, F019, F025, F026, F027, F028, F029, F030, F031, F032, F033, F034, F035, F036, F037, F038, F039, F040, F041, F042, F043, F044, F047, F048, F049, F050, F051, F052, F054, F055
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