From Lineage 2 Encyclopaedia

Properties

Crossbow Mastery
Increases P. Atk. by 12.64 when using a crossbow.
Class	Warder
Type	passive
Attribute	-
Recast time	0 s
Cast time	0 s
Cast range	0
Classes with same skill	Warder, Soul Breaker-, Arbalester, Soul Hound-, Trickster, Inspector, Judicator

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
20	1	Increases P. Atk. by 12.64 when using a crossbow.	0	0	4
24	2	Increases P. Atk. by 18 when using a crossbow.	0	0	6
28	3	Increases P. Atk. by 21.28 when using a crossbow.	0	0	7
28	4	Increases P. Atk. by 24.88 when using a crossbow.	0	0	7
32	5	Increases P. Atk. by 29.04 when using a crossbow.	0	0	10
32	6	Increases P. Atk. by 33.6 when using a crossbow.	0	0	10
36	7	Increases P. Atk. by 38.72 when using a crossbow.	0	0	13
36	8	Increases P. Atk. by 44.32 when using a crossbow.	0	0	13