Harsh is a large water-based Bydo mecha designed to intercept and destroy intruders. Harsh attacks by leaping upward, out of a water source, and firing large missiles at invaders. It's a weaker enemy, despite its large size. Harsh will telegraph where it's going to appear by disturbing the top of the water a few moments before it rockets upward.
A water based offensive system automatically triggered by invaders. Fires missiles at its enemies.
It's encountered during the first section of The Ruins.