From Lineage 2 Encyclopaedia

Properties

Chant of Vampire
For 20 minutes, has a chance of giving all party members the ability to recover as HP 6% of any damage inflicted on the enemy.
Class	Warcryer
Type	buff
Attribute	-
Recast time	5 s
Cast time	2.5 s
Cast range	0
Classes with same skill	Warcryer, Doomcryer

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
44	1	For 20 minutes, has a chance of giving all party members the ability to recover as HP 6% of any damage inflicted on the enemy.	154	0	37
58	2	For 20 minutes, has a chance of giving all party members the ability to recover as HP 7% of any damage inflicted on the enemy.	213	0	121
66	3	For 20 minutes, has a chance of giving all party members the ability to recover as HP 8% of any damage inflicted on the enemy.	244	0	310
74	4	For 20 minutes, has a chance of giving all party members the ability to recover as HP 9% of any damage inflicted on the enemy.	272	0	1000