Hive Leader 2: Fall of the Empire

Ah, yes, that's correct. The battle starts there, according to the quest conditions (or so it seems), or rather, if you don't manage to return to the upper level of the dungeon before Loran arrives. This is equivalent to failing the quest – a squad of executioners comes for you and executes you. RedHeavenHero wrote everything correctly; you need to ascend to the surface the day before the enemy arrives and wait for him there.