OrlandoNative wrote:*IF* they could be given enough endurance, what they *could* be used for is as *mines*.
Forget about "going after" anything. Use the drives for "station keeping" as necessary, under low enough power that the stealth fields conceal it, and just wait for the enemy to come to you. Whatever the spider drive is, it's got to be some sort of direct field manipulation. If it were material, like a rocket, it could be seen. Or at least easily detected. Even if it used ion propulsion, the trail should be easily detectable. That would obviously be a non-optimal situation.
However, any direct field drive known is going to create some kind of "stress" in spacetime, be it magnetic, gravitational, or whatever. And even a coasting body, not under drive power, is going to occult stars and other objects. All of which a sophisticated enough mine could possibly detect. Then all it needs to do is "lase" in the direction of highest probability. Indeed, if seeded thickly enough, "adjacent" mines could even keep "in touch" via whisper lasers, and multiple units saturate an area of space from all directions.
They already have mines. They don't need to use drones as mines.