by pzratnog » Mon Apr 07, 2014pzratnog wrote:@dmat, each level upgrades independently. Meaning you could get 4 levels on one line and 8 on the other or 5 on one line and 1 on the other. Since a 1 level upgrade is the most common, it's what you see the most. Multiliners often upgrade on the "wrong" stat because it's the lowest. For example, a 70(90) two line artifact may be composed of a lvl85 on the first line and a lvl 55 on the 2nd line. The further away an arti is from its max level, the greater the upgrade potential. Therefore, the first line is more likely to get a 1 level upgrade than the 2nd line.
TIL this information has actually been available and well known 2 years ago, I just didn't use the forums back then and it was never entered into the wiki. There was a 2 month long discussion about arts back during a major update when I first started playing heavily. Once again, thank you for being the one who put this in the lime light.