Increase the bonus on the effect, not the level of the skill. The bonuses will be added to the amount of damage (when using that type of attack)or the amount of healing (when healing).
These bonuses and malus only work when the hero uses this skill.
Bonus for the effect of the skill
Increase the bonus on the effect, not the level of the skill. The bonuses will be added to the amount of damage (when using that type of attack)or the amount of healing (when healing).