Mordenkainen's Magnificent Mansion

A 7th Level Conjuration spell

Casting time: 1 minute

Duration: 24 hours

Range: 300’

Components: V, S, M (a miniature statuette of a portal
crafted from ivory, a small piece of polished marble, and a tiny silver spoon,
each item worth at least 5gp)

Can be learnt by: Bard, Wizard

You conjure an extradimensional dwelling in range that lasts
for the duration. You choose where its one entrance is located. The entrance shimmers
faintly and is 5’ wide and 10’ tall. You can any creature you designate when
you cast the spell can enter the extradimensional dwelling as long as the
portal remains open, designated creatures who are larger than the entrance will
be shrunk down to the appropriate size when they come in contact with it. You
can open or close the portal if you are within 30’ of it. While closed, the
portal is invisible but can be detected via magical means such as Detect Magic
or Truesight.

Beyond the portal is a magnificent foyer with numerous
chambers beyond. The atmosphere is clean, fresh, and warm.

You can create any floor plan you like, but the space can’t
exceed 50 cubes, with each cube being 10’ on each side. The place is furnished
and decorated as you choose. It contains sufficient food to serve a nine-course
banquet for up to 100 people. A staff of 100 somewhat-translucent and fully
corporeal servants attends all who enter. You decide the visual appearance (including
race and gender), voice, and personality (if you should feel so inclined) of
these servants and their attire. They are completely obedient to your orders
and those of the guests unless you indicate otherwise. Each servant can perform
any task a normal human servant could perform, but they can’t attack or take
any Action that would directly harm another creature (thus the servants can
fetch things, clean, mend, craft, fold clothes, light fires, serve food, pour
wine, perform sexual activities, etc.). The servants can go anywhere in the
mansion but can’t leave it. If you wish, you can give the servants the ability
to cast non-damage dealing cantrips. Furnishings and other objects created by
this spell dissipate into smoke if removed from the mansion. When the spell
ends, any creature inside the extradimensional space are expelled into the open
spaces nearest to the entrance.

On recasts of this spell, the insides maintain the same
setup as your previous cast, unless you chose to alter it. Servants inside the
mansion will memorize any and all who has entered the mansion, including their
names and preferences. The servants can memorize up to 100 creatures that have
entered the mansion, once the amount of people who entered the mansion exceeds
this number the servants will start to permanently delete memories of previous
creatures, starting with creatures who have spent the least amount of
accumulated time within the mansion over all castings since the first time you
cast this spell.

Casting this spell again before it ends extend the duration
by another 24 hours. If you maintain this spell for a total of 100 days then on
the last casting the material components of the spell are consumed and the
spell becomes permanent. While the entrance is closed, you can choose any point
within 10’ of you to open it. Once made permanent, you can alter any aspect of
the mansion as long as you are inside it, and you can forcibly evict any
creature within the mansion. An evicted creature appears in an open space
nearest to the entrance and cannot enter again until you allow it.