From Lineage 2 Encyclopaedia

Properties

Dagger Mastery
Increases P. Atk. by 3.6 when using a dagger.
Class	Assassin
Type	passive
Attribute	-
Recast time	0 s
Cast time	0 s
Cast range	0
Classes with same skill	Rogue, Treasure Hunter, Hawkeye, Elven Scout, Plains Walker, Silver Ranger, Assassin, Abyss Walker, Phantom Ranger, Scavenger, Bounty Hunter, Sagittarius, Adventurer, Wind Rider, Moonlight Sentinel, Ghost Hunter, Ghost Sentinel, Fortune Seeker

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
20	1	Increases P. Atk. by 3.6 when using a dagger.	0	0	4
24	2	Increases P. Atk. by 6 when using a dagger.	0	0	6
28	3	Increases P. Atk. by 7.4 when using a dagger.	0	0	7
28	4	Increases P. Atk. by 9 when using a dagger.	0	0	7
32	5	Increases P. Atk. by 10.8 when using a dagger.	0	0	10
32	6	Increases P. Atk. by 12.8 when using a dagger.	0	0	10
36	7	Increases P. Atk. by 15.1 when using a dagger.	0	0	13
36	8	Increases P. Atk. by 17.6 when using a dagger.	0	0	13