From Lineage 2 Encyclopaedia

Properties

Arcane Disruption
Decreases the enemy's Casting Spd. by 23% for 30 seconds.
Class	Warlock
Type	debuff
Attribute	-
Recast time	4 s
Cast time	4 s
Cast range	600
Classes with same skill	Warlock, Arcana Lord

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
56	1	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	52	0	105
58	2	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	54	0	121
60	3	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	55	0	151
62	4	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	58	0	200
64	5	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	60	0	210
66	6	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	62	0	310
68	7	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	64	0	478
70	8	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	65	0	711
72	9	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	67	0	748
74	10	Decreases the enemy's Casting Spd. by 23% for 30 seconds.	69	0	1000