The combination of 'Necromancer' and 'Soul Core' seems like a system ripe for some kind of exploitation. Dungeon cores eat souls to make mana, but is that a "permanent destruction of the soul" deal or an "xp loss on resurrecting at the church" deal. If it's the later, could the MC could capture souls and feed them to his core repeatedly? If it's the former, could he partially drain a soul with the core for his sustainable hero farming?