every tech in aurora has levels, as you may have seen, for example
- L1: 10 cm laser aperture
- L2: 12 cm laser aperture
- L3: 15 cm laser aperture
or
- L1: nuclear pulse engines
- L2: nuclear thermal engines
- L3: ion engines
...ect.
A ruin of tech level 2 will have a chance of revealing to you 2nd tier techs, for example 12cm lasers or nuclear thermal engines
a ruin of tech level 3 will have a chance of reavling to you 3rd tier techs, for example 15cm lasers or ion engines.
I find there's a tendency to overestimate my tech levels, so when I find a TL4 ruin I'm initially like "oh MAN! Come on! I already have engines and sensors and lasers twice that good!"
...but I usually don't have missile agility that good and plasma carronades that good and meson cannons that good ect.