1) He lays waste 2) One who lays waste 
• (n.) One who, or that which, devastates.
Dev'as·ta`tor noun [ Latin ] One who, or that which, devastates. Emerson. 
The USS Devastator was an American Auk Class minesweeper of 890 tons displacement launched in 1943. The USS Devastator was powered by diesel engines providing a top speed of 18 knots and carried a complement of 105. She was armed with one 3 inch dual-purpose gun and two 40 mm anti-aircraft guns.
devastator Someone, or something, which brings ruin or desolation with some form of violent action.