When ever the apocalypse happens there is always someone who's the first victim. For Eric when the system arrived he slept through the apocalypse and died because of it. But due to the intervention of the system and the administrators for it, he was given a second chance at life as a dungeon core. Determined to never suffer the same fate again Eric quickly adapts to the situation and decided to become the greatest dungeon the world has ever seen. After choosing a new name recognized by the system he quickly begins to build his dungeon. But will he survive long enough to achieve his goal of survival or will adventurers shatter his core before he can rise to power.