The mages in the control room had activated the fortress's latest enchantment, conjuring a gigantic field of the dead throughout the fortress.
Whether soldiers, adventurers or crusaders, everyone was temporarily blinded and unable to breathe. Those capable of circulating mana managed to prevent the corrupted world energy from corroding their skin, but it didn't do much to improve the overall situation.
Screams of pain and panic from soldiers trying to talk to each other were heard, but all were silenced by the sounds of buildings being crushed and bones creaking.
The bone abominations destroyed the buildings they were in to break free, roaring in happiness. They didn't like to be disassembled after their master had finally assembled them into a proper shape.
The closest soldiers were shocked by the sounds of destruction, but the bone abomination trampled them all and ran towards the gate, just as its master had ordered.