Undead Lord, Why Are You Summoning Players?

What happens when you travel back in time to become a dungeon lord and be able to recruit players? [You have developed a new unit: ordinary skeleton → metal skeleton → heavy metal skeleton turret. Skeleton player: Damn it, this job-changing path is great. Newcomers remember to just follow the original path. What's the difference between this and driving a Gundam? [You have developed a new unit: Skeleton Hound → Dark Hound → Sky-Tearing Vicious Dog. Vicious Dog Player: It's boring. It's not as good as a dog. It's too much like a human being, so I don't want to be a human being anymore! Woof~ [You have developed a new race: Skeleton Bat→Shadow Bat→Stealth Bomber. Bat player: You know nothing, do you know what a noble air force is? How to fight the dragon without air superiority? You have developed... [You have ruled the dungeon and been promoted to the dungeon overlord. [You can rule multiple dungeons to unlock achievements and become the Underground Emperor. The adventurer entered the dungeon and was a little stunned when he looked at the huge kingdom of death in front of him: Me? Beat this dungeon? I?