Dragon's Wyrmhaven

You create an extradimensional mansion that is a haven for dragons. The mansion is similar to Magnificent Mansion but is constructed to accommodate the size and temperament of dragons. The entrance to the mansion appears as the giant gaping jaw of a dragon, complete with sharp teeth and a fiery breath effect that doesn't damage anyone who enters. 

Inside, the mansion's halls and chambers are spacious and feature high vaulted ceilings, sturdy stone walls, and rows of torches that cast a dim light. The mansion has all the necessary accommodations suited for dragons such as large ceilings, fire pits, food storage, and more. 

The mansion can accommodate up to 10 dragons, however, any other creature attempting to enter the mansion will be blocked by an invisible force field. The force field can be dropped by the person who created it. Once the force field is down the dragon can also bring up to ten additional creatures into the mansion. 

The mansion can be entered from any of its entrances by any dragon, chosen creature, or the caster of the spell while it is active. The mansion appears in any open space no larger than 100-foot cube that you can see. The portal to the mansion is a circular opening about 20ft in diameter.

The mansion lasts for 24 hours, after which it disappears along with everything inside, regardless of its current occupants. You cannot re-cast this spell until the mansion has disappeared.

At Higher Levels. When cast at higher spell slots, the mansion can accommodate additional dragons and creatures as follows: 

  * 8th level – 15 dragons and up to 15 additional creatures

  * 9th level – 20 dragons and up to 20 additional creatures