Novel and ff ideas for authors

A demon lord got bored because the heroes who come and kill him are not strong enought so the demon lord created dungeons with monsters the demon lord also created and traps and many others.

And each dungeons have a boss monsters and many or more hidden mechanisms will trigger if certain conditions are fulfilled, because humans will always find a way to easily clear it. And when heroes are strong enought they can challenge the demon lord and defeat the demon lord itself.

And the rewards for defeating the dungeon are items from the treasury of the demon lord that is said to contain every treasure in the world, and treasures that have not existed from the history or treasures that did not exist in this world and are used as rewards in the dungeon.

It is said that in the history the world was peaceful before where humans, elves, and dwarves lived peacefully besides the dragons that kidnaps princesses and groom them. And one day everything changed when a very beautiful shooting star the size of a mountain hit the world, and when they followed to where it hit it only led them towards a gigantic huge hole, that you cannot even see light only darkness below.

And then the monsters appeared and begun massacre eating any living being that they saw with their eyes, and so heroes were born to challenge this gigantic huge hole filled with monsters. And when they finally reached the deepest part of the hole they met a huge castle they entered it and saw the demon lord but they always got defeated in the process. Probably because the heroes were weak or probably the demonlord hidden the monsters on the middle part of hole to the deepest part of the hole in his/her castle.

Because the demon lord can no longer wait and chose to challenge them but realised they were too weak so instead of making the hidden monsters appear in their floors in the hole. The demon lord created the dungeons because he/she have grown tired of living beings invading his/her home making his/her not get a good sleep everytime living beings from the surface invade and challenge him/her.

The demon lord see the living beings from the surface as food and also see them as entertainment, but also sometimes kidnapps females from the surface and turned them into maids. Cause it can help the demon lord not forget that they looked exactly like the invaders and its food, so the demon lord's maids sometimes assasinate him/her but always failed.

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I think this idea is good like that manga i just read but the manga is where he died for some reason and his control over his dungeons have been manipulated by someone, and for some reason he got reincarnated to japan and his dungeons are also there.

And i made this chapter idea for that the demon lord will not die and reincarnate, and no systems, and no reincarnation, and the demon lord i see is invincble and looked like a real villain not like a normal average manga, manwha mc.