I'm a Roadblock

I am a demon dragon who has awakened the roadblocking dragon system As long as you intercept adventurers who want to defeat the Demon King, you can evolve and grow into a powerful ancient dragon step by step! Build a dungeon full of dark mechanisms, fill it with Mimics, and let adventurers play Dark Souls inside. Spreading rumors everywhere caused civil strife among the humans, leaving the king with no time to attack the demons. Establish a monster girl custom shop to completely destroy the adventurers' fighting spirit. The mother of the child of prophecy was captured ten years in advance, so that the brave man who could pull out the sword of king would not be born. Transform into a sage and trick a team of adventurers into defeating other demon kings. After success, they stab you in the back and seize the fruits of victory. I'm bad. Yes, after all I said, I am a dragon. (PS: I have been a dragon, so I am not writing blindly)