So I was minding my own business, exploring Gliese 1061, which happens to have what appears to be quite a few planets that can support a colony, when suddenly I come across Gliese 1061 Aliens #1091. Who take out half my scattered survey group. With just a single ship.
A single ship, with the following stats:
Name Triththail 002
Sensor S216/R20: Strength 216, Resolution 20, Max Range 43.2m km, GPS 4320
Cross Section 157
Estimated Tonnage 7850
Thermal Signature 1125
Observed Speed 7165
Estimated Speed 7165
Shield Strength 0
Recharge Rate 0
Armour 2
ECM 50
Est. Jump Dist 0
7 launchers, Size 11 Strength 8 missiles, so fast my sensors can't even lock on fast enough to fire AMMs.
At least it appears to have light armor, no shields, and no AMMs or CIWS of its own...
I jump two battle groups into the system, loaded up with short-to mid range missiles, immediately pick up active sensors, close, and open fire.
It managed to take out one missile destroyer and one destroyer escort, and severely damage the other destroyer escort before it fell to my own "Lancer" class SR ASMs. Though it took all six missile destroyers to do it. I'm lucky one escort survived; it's the only ship in the battle group with active sensors. I hope not all aliens are this deadly- I'm only on the second or third tech tier in this game.