From Lineage 2 Encyclopaedia

Properties

Curse Chaos
Decreases the enemy's Accuracy by 9 for 30 seconds.
Class	Spellhowler
Type	debuff
Attribute	-
Recast time	2 s
Cast time	1.5 s
Cast range	600
Classes with same skill	Wizard, Sorcerer, Necromancer, Warlock, Dark Wizard, Spellhowler, Phantom Summoner, Archmage, Soultaker, Arcana Lord, Storm Screamer, Spectral Master

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
35	1	Decreases the enemy's Accuracy by 9 for 30 seconds.	15	0	11
40	2	Decreases the enemy's Accuracy by 12 for 30 seconds.	35	0	30
44	3	Decreases the enemy's Accuracy by 12 for 30 seconds.	39	0	37
48	4	Decreases the enemy's Accuracy by 12 for 30 seconds.	44	0	67
52	5	Decreases the enemy's Accuracy by 12 for 30 seconds.	48	0	96
56	6	Decreases the enemy's Accuracy by 12 for 30 seconds.	52	0	105
58	7	Decreases the enemy's Accuracy by 12 for 30 seconds.	54	0	121
60	8	Decreases the enemy's Accuracy by 12 for 30 seconds.	55	0	151
62	9	Decreases the enemy's Accuracy by 12 for 30 seconds.	58	0	200
64	10	Decreases the enemy's Accuracy by 12 for 30 seconds.	60	0	210
66	11	Decreases the enemy's Accuracy by 12 for 30 seconds.	62	0	310
68	12	Decreases the enemy's Accuracy by 12 for 30 seconds.	64	0	478
70	13	Decreases the enemy's Accuracy by 12 for 30 seconds.	65	0	711
72	14	Decreases the enemy's Accuracy by 12 for 30 seconds.	67	0	748
74	15	Decreases the enemy's Accuracy by 12 for 30 seconds.	69	0	1000