The Scorpion is a pop-up sabot rocket battery that boasts high damage and range for a relatively low cost. It's especially good vs. fast, low-health raiders & skirmishers, but also excels in destroying heavier units.

Switch it off when targeted by artillery to soak up huge amounts of damage.

When "popped down", its higher effective HP makes repairs vastly more efficient, so keeping Construction Turrets within range and tactically retracting threatened Scorpions is a good way to keep them in the fight.