The spur-dike is a common important building which is usually used in river course improvement projects, controlling river trend, bend protection, beam attack sand and high water levels.

If kill Demon From Below first (harder, as it starts at 100% health in phase 2), then The Demon Prince appears to have a few lazer beam attacks, which leave him really vulnerable to attack.

The main attack of the Cryocopter is the Freeze beam, which will literally freeze all types of units after a certain number of shots.