The Ghost is a stealthy and cloakable spy bot that's totally invisible to your enemy. When it self-destructs, it unleashes a 5,000 EMP damage charge that stuns units in a 360 area of effect.

Self-destruct it near an enemy Prevailer to disable it and pave the way for a nuke.

It is also good to spot nearby enemy units so your artillery has a clear target. However, beware that it can be detected if the enemy has a Nemesis within range.

Spy bots can Reclaim, which is useful for removing Dragon's Teeth or walls in its way, or slowly reclaiming enemy buildings. Beware that they must decloak to do this!