As you can see, i am unable to learn buff slot lvl 3 and above. The NPC just says "there is nothing more to learn". Tested in 3-4 towns and all the same. Maybe you can look into it.
Yes, it gives percentage, but not to the whole buffed stat (It should give "%" to unbuffed Stat always)
For example i get tts+6/+7, all mdef buff, no zerk, tallum robe set and i have lets say ~2.3-2.4k mdef. Add to that mdef augment active lvl 10 and i get mdef 3.6k!
That is not right.
As I tested some Augment skills i noticed a very disturbing bug/ skills that doesnt work properly. Normally a active/ passive/ chance augment should give a static increase in stats (without any modifier whatsoever).
Instead of that, it actually adds a percentage ("%") to the whole BUFFED specific stat . That greatly unbalances and affects gameplay. I took the liberty of taking a few screenshots so you can identify easier what i mean.
Edit: I tested all active/passive skills and it is like i said for all of them (Empower and WM active are imba for mages and mdef/pdef active imba for bp :D)
With kind regards,
G3ralt