I’m not sure if it’s a bug or just unlucky/incorrect description, but:
In the description of every refine skill there is the following line:
Skill to refine this resource. +10% bonus to refining per level.
As maximum skill level is 8:
- at skill level 8 the maximum efficiency is achieved: 100%
- at skill level 7: 90%
- at skill level 6: 80%
- at skill level 5: 70%
etc. - at skill level 1: 30%
In other words, 0.2 + 0.1*skill
However, currently it seems to be wrong, starting with 20% and probably getting up to 90% at level 8:
I get 20% with skill level 1 and 60% with level 5.
→ 0.1 + 0.1*skill