Beelzebub

You can access the Beelzebub instance by asking the statue in the center of the map to open the portal. This instance does not have a dungeon. You can directly summon the MVP in the center of the map and set aside time to prepare.
Unlike the usual map, you will not be disturbed by the monsters present on the map. On the other hand, if your whole team is decimated, you must wait 2 days before being able to return again.