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Several things were happening the moment we conquered the dungeon and I went to steal the dungeon core, first of all, a very creepy spirit of the dungeon (?) or something showed up, and he began to praise an old guy that I thought was just some legend to explain the existence of dungeons in this world, but apparently the guy was more than real and he left an inheritance here. However, although I wanted to get to the juicy reward quickly, this guy was talking too much.
And he spoke a lot of things we didn't get, we were just standing there while this guy began talking as if he really was missing some contact with people, and I cannot really blame him when he has been confined here for apparently millions of years… Poor guy, and he probably doesn't even need to sleep because he's some sort of spirit or something… which makes it worse.
Check "The Protagnist's Sister Is Actually the Strongest"!