From Lineage 2 Encyclopaedia

Properties

Heavy Armor Mastery
Increases P. Def. by 17.7 and decreases received Critical Damage by 15% when equipped with heavy armor.
Class	Palus Knight
Type	passive
Attribute	-
Recast time	0 s
Cast time	0 s
Cast range	0
Classes with same skill	Human Knight, Paladin, Dark Avenger, Elven Knight, Temple Knight, Swordsinger, Palus Knight, Shillien Knight, Bladedancer, Phoenix Knight, Hell Knight, Evas Templar, Sword Muse, Shillien Templar, Spectral Dancer

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
20	1	Increases P. Def. by 17.7 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	4
20	2	Increases P. Def. by 19.1 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	4
20	3	Increases P. Def. by 20.5 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	4
24	4	Increases P. Def. by 23.5 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	6
24	5	Increases P. Def. by 25 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	6
24	6	Increases P. Def. by 26.7 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	6
28	7	Increases P. Def. by 30 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	7
28	8	Increases P. Def. by 31.8 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	7
28	9	Increases P. Def. by 33.6 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	7
32	10	Increases P. Def. by 37.4 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	10
32	11	Increases P. Def. by 39.3 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	10
32	12	Increases P. Def. by 41.3 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	10
36	13	Increases P. Def. by 45.6 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	13
36	14	Increases P. Def. by 47.7 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	13
36	15	Increases P. Def. by 50 and decreases received Critical Damage by 15% when equipped with heavy armor.	0	0	13