Doing the “Sub-quest” is one of the tips and tricks on how to level your hero/character in Lineage 2 Revolution. There are 5 available sub-quest every day and you can reset it three times per day as well. But in order to reset the sub-quest, you need to spend 50 red diamonds on each reset.
And for you to do sub-quest, you need to have quest scrolls. There are four grades of scrolls C, B, A and S. These scrolls are dropped by field monsters. Quest scrolls A and S is highly recommended to use because of the large number of exp rewards and Adena.
In this video, you will the difference between quest scroll A and quest scroll S. And on how to reset the “Sub-Quest”.