Almut's Mind Castle

After 10 minutes of staying in meditating position like sitting or laying, the caster enters its Mind Castle, which can represent a room, a cellar, part of a forest, or any abstract place.

In the 10th minutes, the caster enters this mind dimension. If the caster receives any damage or being interrupted by direct awakening (physical or magical impact) the spell ends.

In this stasis, the caster can search for any memory from their past to relive and remember every detail. Remembering one scene or find out a specific detail requires 5 minutes.

In addition, the caster can choose to prepare 2 additional spells until the next long rest. The caster must burn one spell slot in the 10th minute and stay in the Mind Caste for 50 minutes or the spells can't be prepared. The spells must be lower levels than the consumed spellslot.

The caster can recast this spell to switch the 2 additional spells for others, but the mentioned conditions are necessary in this case too.

Using Detect Thoughts allows other characters to enter the caster's Mind Castle without being noticed if the caster failed the saving throws determined under Detect Thoughts.
Else the caster notices the breaking attempt and will be able to deny it. Or the caster can choose to let the other person inside (in this case saving throws are not necessary).
They can both leave at any time and can't harm each other, but they can communicate if they share languages.
If the caster of Mind Castle ends the spell, everyone else drops out.