Spider is a fast, stealthy, all-terrain EMP bot. It doesn’t deal any damage itself, but it can paralyse enemy units with its close-range EMP laser. Very effective to use as a supportive unit in combination with Recluse.
Try to keep them marching on the front of attacking units. They are quite mobile, micro them to evade enemy attacks.
Also works well in combination with other combat units like Zeus.
Spiders are almost immune to EMP weapons, so it is hard to paralyse them.