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 Recommended Skill Tree
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Dagger Mastery 19 - Savage 30 - Boost 5 - Haste 20 - Boost 20 - Endure 20 -
The rest is up to you. You may put one extra point in Dagger Master to max it,
put more points in Dark Sight, put some points in Steal or in Kin Eyes and
Lucky Seven for fun.

N.B. Why do you only raise Dagger Mastery up to 19?
Every odd number skill level, Mastery will increase your minimum damage up to
percentage specified times your maximum damage. Also, every single skill level,
Mastery will increase your accuracy by 1. Mastery is important by its ability
to make your attack damage stable not by increase in accuracy. 1 more accuracy
is not that effective.
Why bother about 1 sp?
Savage 1~10: attack 2 times
Savage 11~20: attack 4 times
Savage 21~30: attack 6 times
So, if you save 1 from Master, you can attack 6 times from level 43. If you do
not save 1 from Mastery, you can attack 6 times from level 44.
Why do you raise Mastery first, not Savage? Savage looks way cooler than Double
Stab!
Savage does not work well without Mastery. If you raise Master first, your base
damage will be more powerful and stable without further MP cost. However, if
you raise Savage first, your base damage will be more powerful but not stable
and MP cost is almost doubled.
At 30, Savage: Attack 6 times each 80%, that is 480%, with MP cost of 27.