Tremor is a miniature, mobile version of a Calamity. It is a very fast shooting artillery vehicle with an incredible range that can compete with longest-range defenses like Pulsar. It shoots along a parabola, making it able to target units over walls and hills. Due to its high costs it has a situational usage.
It is useful on maps with many natural barriers separating different sections and bases.
Creating a rain of plasma, it shoots and damages units in a huge area. Be careful with your own units so that they don't end up under Tremor's mighty spread of fire!