Reincarnation Dungeon: Invincible from the Start

[Reincarnation Dungeon] [Western Fantasy] [Unchanged Person] [No Female Protagonist] [Protagonist Not Pretentious] [Hardcore Style] [Weak System Flow] [No Tasks] [No Death Pressure] As an architect, Gu Lun was reborn after his death and became the only dungeon in a Western fantasy world. After discovering the existence of indestructible materials in the system panel, he decided to make his core undestructible. After that, he began to build a dungeon while observing the story of intelligent creatures in this world. There is no such thing as the protagonist leaving the dungeon, and there is no such thing as the protagonist having feelings for others.