ToME: the Tales of Maj'Eyal

Luckdrinker consistently gives less evasion than described. At talent level 5, it is supposed to give 20% evasion at 10 stacks, but the tooltip says it only gives 15.

I also note that this feature is described as "if you know Preordain", but learning Preordain is mandatory to get to Luckbringer.

I noticed that on stack 7 it gives 0% and then increments by 5% for the remaining 3 stacks