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[I know that this might be too confusing, but Dungeons are part of the Realm when you conquer one, you actually conquered a part of the Realm's [Land], after conquering dozens of dungeons all across the Lower Realm, you've managed to successfully conquer all of this [Land] and also fuse with it! Making it all your territory]
[Now that you've conquered all of this territory, the requirements for a hidden system function that has never been implemented emerged, it seemed that the System Master had created it for himself, and this is why it was so saved up, but now that you unlocked it due to having copy-pasted the System into your soul, you are free to utilize it!]
"What is the name of this function?"
[The name is the [Realm Conquest] Function! By creating a [Realm Core] here, you will be able to manipulate and have supreme authority over this entire part of the Realm, as if it were a dungeon!]