You play as a mighty Demon Lord, who has decided that he would like to create his own dungeon.
So, you start building halls and corridors, set traps for the poor fools who will enter the dungeon and convince goblins and other monsters that your dungeon is the perfect place for them to settle down. And there is that part of the dungeon, too where your private quarters are located and which can be expanded too. You might build a labratory to research magic potions, a forge to equip the monsters with better weapons or prison cells.
