[spoiler:1p2b18f3]Invaders are tough!! PA panels that can flush 300+ points of damage in less than a minute. Plasma Torps that travel at 80,000 kps and recycle quickly. and they appear to reproduce in a similair manor to Swarm!! (just had 2 popup around wreckage from their first incursion into Sol system and the wormhole is picketed!!)
Missile fighter swarms have worked best for my in killing them. Have to alpha wave them or the PA panels just dump the damage.
Plasma Torps are only seen on thermals for a short time and so far never on active so point defense is useless.
Since they spawn, salvage ships have became much more important stategicly.[/spoiler:1p2b18f3]