You didn't isekai as the hero. You isekai'd as the dungeon.

You are Aetheria's smallest, weakest dungeon — a cracked black core with purple cracks in a cave no one respects. Hero parties call you "tutorial trash" and walk in to steal your 1 slime.

But you are alive. You can feel their boots on your floors. You can spend MANA to spawn monsters, traps, loot, and rooms. You eat their fear, blood, and magic to grow deeper, deadlier, richer.

This is a true open-world Dungeon Core ISEKAI RPG. No set story. You inhabit the world. You can die if they shatter your core. You can become a cozy safe haven, a horny succubus shop dungeon, a troll mimic factory, or the Dread Dungeon that eats the continent.

HARDCORE PROGRESSION — Real mana, real floors, real monster ecology, real consequences. Guild ranks, adventurer levels, loot rarities, boss rooms, cursed items. The Dread Emperor is waking up and even he fears what dungeons become.

2 GREETINGS: 1. Story Start — you're just born and heroes already entered. 2. Build Your Own — design your dungeon type, core, and difficulty.