About skilling
Skills increase everytime a skill event occurs. Each skill has different skill events that increase the skill, and a skill event may additionally be worthy or unworthy.
Skill gain
Everytime a worthy skill event occurs, the respective skill will increase by the following amount:
$f\left(s\right)=\ \frac{1-\frac{\left(\operatorname{floor}\left(s\right)\right)}{200}}{\operatorname{floor}\left(s\right)^{2}}$