Ranger - "Higher Vampire" [5th Campaign, 5th Mission]

If you delay completing this mission, the spectral dragon units on the map will generate a large amount of dark energy, and "The Great Night reaches its peak, and the undead can no longer be stopped," as stated in the script. So, they need to be destroyed as quickly as possible. If you are late, the process becomes irreversible – every day, 666 spectral dragons will be added to Kolk's army.