From Lineage 2 Encyclopaedia

Properties

Soul Barrier
Spreads the soul's defensive barrier to increase your Bow Resistance + 10, Crossbow Resistance + 10, and M. Def. + 100% for 30 seconds.
Class	Berserker
Type	buff
Attribute	-
Recast time	300 s
Cast time	1 s
Cast range	0
Classes with same skill	Berserker, Arbalester, Doombringer, Trickster, Tyrr Doombringer

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
58	1	Spreads the soul's defensive barrier to increase your Bow Resistance + 10, Crossbow Resistance + 10, and M. Def. + 100% for 30 seconds.	22	0	154
63	2	Spreads the soul's defensive barrier to increase your Bow Resistance + 15, Crossbow Resistance + 15, and M. Def. + 100% for 30 seconds.	25	0	154
74	3	Spreads the soul's defensive barrier to increase your Bow Resistance + 20, Crossbow Resistance + 20, and M. Def. + 110% for 30 seconds.	28	0	154