From Lineage 2 Encyclopaedia

Properties

Light Armor Mastery
When equipped with light armor, increases P. Def. by 12.6, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.
Class	Orc Mystic
Type	passive
Attribute	-
Recast time	0 s
Cast time	0 s
Cast range	0
Classes with same skill	Orc Mystic, Orc Shaman, Overlord, Warcryer, Dominator, Doomcryer

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
7	1	When equipped with light armor, increases P. Def. by 12.6, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.	0	0	1
7	2	When equipped with light armor, increases P. Def. by 14.5, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.	0	0	1
14	3	When equipped with light armor, increases P. Def. by 17.5, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.	0	0	2
14	4	When equipped with light armor, increases P. Def. by 19.3, Casting Spd. by 90%, Atk. Spd. by 25%, and MP Recovery Bonus by 20%.	0	0	2