Mentor Guide:
A mentor can take up to 3 mentees. Every time when a mentee levels up, their mentor gets Mentee's Marks by mail. These marks can be traded for valuable items.
[The amount of Mentee's Marks for reaching different levels]<br1> Lv. 85: 5000 <br1> Lv. 99: 10,000 <br1> Lv. 103: 25,000 <br1> Lv. 105: 60,000
After taking your marks from a letter, don't forget to delete it. If your mailbox is full, you won't be able to receive new items.
If both the Mentor and the Mentee are playing at the same time, the former receives powerful buffs while the latter gets a bonus to acquired XP/SP.