Unusual

[Extra dungeon entry scroll: After use, enables player to enter the dungeon that hasn't opened a special dungeon]

[Note 1: Because it is an extra entry, the dungeon world will not have missions and ratings]

[Note 2: Player can stay no longer than 12 weeks]

[Note 3: Player cannot acquire equipment through the orthodox way]

[Note 4: The number of equipment and items that player can bring depends on the dungeon]

[Note 5: Player's companion has to stay back in the game room]

[Note 6: Able to enter anytime, unaffected by dungeon cooldowns and likewise will not be calculated towards dungeon entry count]

…

As Kieran grabbed the scroll, the details started to pop up.

All the restrictions didn't exceed Kieran's expectation though, how could it be similar to a normal dungeon entry since it was entering through special means?

It was similar to an official entry and illegal entry of a country, both were two different concepts.