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After handing the Grace Card over to Azazel for modification, Azazel told Noah to come back in a few days to collect it.
With the Underworld's technology for constructing otherworldly spaces, modifying the environment inside the Grace Card was not difficult.
The reason it would take several days was because Azazel wanted to study Noah's Grace Card.
In truth, the function of a Grace Card was nothing particularly rare to those on the mystical side of this world.
After all, many mysteries such as sorcery and magic in this world could open entrances to otherworldly spaces and use them as storage spaces. In terms of convenience, they were almost comparable to Grace Cards.
The weapons of Xenovia, Irina, and Yuuto were usually stored in otherworldly spaces and only taken out during battle.
If even Xenovia, Irina, and Yuuto used this method to store items, then there was no need to mention anyone else.
However, the otherworldly spaces here could not store just anything.
Existing between the real world and the dimensional gap, those spaces possessed harsh conditions beyond outsiders' imagination. They basically could not store living creatures, food, drinking water, daily necessities, or other ordinary things, and could only be used for unconventional tools and items.
Therefore, otherworldly spaces were used to store powerful weapons, rare tools, and legendary items that were not needed in everyday life. No one ever used them to store daily necessities.
That was also why, when they had gone to Vampire Territory last time, the Gremory peerage members had all needed to bring their own luggage.
When Azazel said Noah's Grace Card was convenient, he was referring to its broad storage capacity.