Each invitation allows you to enter the Courtyard area once.
If you leave it, you will need to acquire additional invitations to re-enter it.
This, however, has some merits as well - leaving the Courtyard won’t reset the map.
Invitations can be acquired from special enemies called Gatekeepers.
They spawn randomly with other enemies and you might encounter them during any non-boss fight.
This can be repeated multiple times to acquire multiple invitations.
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