Vanquisher I: Win 50 duels in Dragon's Arena-Challenge Points: 5
Vanquisher II: Win 100 duels in Dragon's Arena-Challenge Points: 10
Vanquisher III: Win 200 duels in Dragon's Arena-Challenge Points: 20
Terminator I: Win 10 Tournament duels-Challenge Points: 10
Terminator II: Win 50 Tournament duels-Challenge Points: 15
Terminator III: Win 100 Tournament duels-Challenge Points: 20
Spectre I: Win 15 Tournaments-Challenge Points: 20
Spectre II: Win 55 Tournaments-Challenge Points: 25
Spectre III: Win 105 Tournaments-Challenge Points: 50
Those are all the challenges in combat mastery. If you complete all the challenges you will unlock a new rank.
Rank: Dragon Mercenary