In the month I first received my game, there was this one game where I ended with the Precursor Ranger (the powerful one). I had purchased it from another race to make sure it wasn't used against me as someone in the forum suggested. I used it as the spearhead of my invasions, taking out defenders on a planet before sending troop modules. I hadn't figured out how to used fleets yet.
In that game the mega pirate event happened and I found that my precursor ranger that had close to 400 hp from all of fighting it had done couldn't take out the pirate fleets.
I looked at the stats of the pirate fleets and found that they had dominating attacks of one kind and strong defense against 2 of the 3 kinds of attacks.
I built 2 kinds of ships to take out the pirates:
One was a heavy hulled ship that had a defense against the Pirate's attack. (I used shield because the pirates had some kind of beam weapon) and I used an attack for which the pirate had no defense. Those ships could survive a fight with one fleet of pirates but not two and were very expensive to build. So I started playing around with the rally point feature until I figured out to build fleets with it.
Once I knew how to make fleets, I build a tiny hulled ship that was maxed out in the attack that the Pirate ships had no defense against. (I called them mosquitos). Those tiny ships had no defense since the Pirates had around 219 attack value whatever defense I would put would be insufficient anyways.. These ships were inexpensive and could be quickly built by my worlds, so I just set up a few rally points and pumped out the production. By that time in the game I had maximum logistics and maximum miniaturization so the tiny fighters could pack quite a punch. (In the 30-40 value range for its offensive value). My logistics value was 64 so I could have 32 tiny ships but I occasionally would put a ship that had the Weapon amplifier bonus. I think I had obtained Hyperion logistic bonuses and/or bonuses from anomalies because when I play now I usually only get up to the 50's in logistics.
My surviving ships from my fleet just went back to a rally point to stock up on new fighters and eventually I wiped out the pirates. I also got a few tiny fighters that eventually got a large amount of hp's.
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In another game, one race got the precursor ranger and used it against me but it really wasn't a factor in the game. I didn't purchase it from the race. The ranger simply can't be everywhere at once. I focused on taking civilization capitals first. The only way it would be a factor if is it went into orbit around its primary capital or one he had conquered. Without the capitals influence makes the other planets fall like dominoes to surrounding influence.
I had the Xalanx defense and the Weapon amplifier in one fleet. I wanted to try it against the precursor ranger but I won an influence victory before my fleet could make it to the fleet containing the Precursor ranger.
I don't usually bother with military starbases but in a recent game, a fleet of 5 ships took out 19 of my ships. I couldn't figure out why until I noticed the military starbase near the planet. Once I took out the military starbase it became much easier.