Reincarnated as a demon inside a dungeon - Chapter 158

Li Rui has been extremely unfortunate for years and this day, he knows there are secret realms in the world. However, the first realm he goes in is the hardest one. But with his bad fortune:Emergency Notice: Attention all Secret Realm agents, an unknown error has occurred in the Twelve Star Dungeon [Fengdu], and it is now indefinitely closed.“Did you mess up the Dungeon again?”“President, looking on the bright side, at least I gathered all the equipment, materials, and skill points, so this time... isn't a loss?”

Liu Jun traversed into a future world and was not able to afford an auxiliary Intelligent Brain. Just when he was mocked by his classmates, he accidentally acquired the gift of fungus evolution, transforming into the Fungus Lord, possessing a Mushroom Soup World.[Welcome to Fungus Planet][Life is but a soup of 70% water fungi cells, your task is to bring plague, disease, and despair to the filthy world, fighting against humanity.]

In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist “I am the real summon master.” Takuma gets slave-turning magic used for summoned beasts cast on him by the girls –

At a young age, I became a thousand-year-old bastard.

Ding! Congratulations to the host, you have obtained the phagocytosis synthesis evolution system.

An earth dragon was found in front, devouring synthetic evolution, the earth dragon tortoise.

From then on, my wonderful career began…

- Description from novelbuddy