I'm not sure if anyone has done any testing on this, but I wonder if the level of Life Stone and the grade of the weapon make a difference.
For instance, I use Crystal Staff to give myself Bless the Body. On that staff, I have now used about 25 Life stones, ranging from level 67 Mid-grade all the way down to low level 46 stones.
End results are all uber crap augments, every single one of them. So far never any Active or Passive skills.
Just how random is random and just how much can one's luck suck?
from the numerous augments I've used its all random. Aside from a higher number in stats from the higher stones, its the same chance as using a regular low one for the active or passives. From the lvl 76 stones i've got either crappy actives or none at all..
From a lvl 46 on my keshes I got power break on my keshes/ vamp 2 on my C grade dagger, and chance of p.atk increase on my soul sep....so yeah, random.
what increases the chances of a nice skill is the grade of the stone but sill you may end up with a bow giving you a crappy nuke or a nuker getting some kind of stun on the weapon
I got enhanced patk in pvp on my SOM. I've tried 6 augments, all level 58 or higher stones, on the SOM, and they've all been melee-oriented with bad stats.
My Damascus got a really nice augment on the 2nd try (chance to para anything that attacks me), along with the flames and sparkles with a 49 mid-grade.