Doomed Dungeon

Bastill is kidnapped and sacrificed. He is turned into a dungeon by his captors and they plan to return in five years time to collect the mature dungeon core. He has to start back at level 1, while his captor is over level 60 ranked at S, she will also be bringing back others from her group when the collect the core. Can Bastille build his dungeon into a fortress, amass an army, and level up in time to protect his core?