From Lineage 2 Encyclopaedia

Properties

Power Break
Decreases the enemy's P. Atk. by 20% for 30 seconds.
Class	Shillien Knight
Type	debuff
Attribute	-
Recast time	2 s
Cast time	1.2 s
Cast range	600
Classes with same skill	Palus Knight, Shillien Knight, Bladedancer, Assassin, Abyss Walker, Phantom Ranger, Shillien Templar, Spectral Dancer, Ghost Hunter, Ghost Sentinel

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
32	1	Decreases the enemy's P. Atk. by 20% for 30 seconds.	14	0	10
36	2	Decreases the enemy's P. Atk. by 20% for 30 seconds.	17	0	13
40	3	Decreases the enemy's P. Atk. by 23% for 30 seconds.	18	0	28
43	4	Decreases the enemy's P. Atk. by 23% for 30 seconds.	19	0	31
46	5	Decreases the enemy's P. Atk. by 23% for 30 seconds.	22	0	51
49	6	Decreases the enemy's P. Atk. by 23% for 30 seconds.	23	0	68
52	7	Decreases the enemy's P. Atk. by 23% for 30 seconds.	24	0	79
55	8	Decreases the enemy's P. Atk. by 23% for 30 seconds.	25	0	89
58	9	Decreases the enemy's P. Atk. by 23% for 30 seconds.	28	0	154
60	10	Decreases the enemy's P. Atk. by 23% for 30 seconds.	28	0	194
62	11	Decreases the enemy's P. Atk. by 23% for 30 seconds.	29	0	266
64	12	Decreases the enemy's P. Atk. by 23% for 30 seconds.	30	0	295
66	13	Decreases the enemy's P. Atk. by 23% for 30 seconds.	32	0	406
68	14	Decreases the enemy's P. Atk. by 23% for 30 seconds.	33	0	632
70	15	Decreases the enemy's P. Atk. by 23% for 30 seconds.	33	0	940
72	16	Decreases the enemy's P. Atk. by 23% for 30 seconds.	34	0	997
74	17	Decreases the enemy's P. Atk. by 23% for 30 seconds.	35	0	1428