From Lineage 2 Encyclopaedia

Properties

Mortal Blow
Attacks the target's vital points with 73 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.
Class	Dark Fighter
Type	active
Attribute	-
Recast time	3 s
Cast time	1.08 s
Cast range	40
Classes with same skill	Human Fighter, Warrior, Gladiator, Warlord, Human Knight, Paladin, Dark Avenger, Rogue, Treasure Hunter, Hawkeye, Elven Fighter, Elven Knight, Temple Knight, Swordsinger, Elven Scout, Plains Walker, Silver Ranger, Dark Fighter, Palus Knight, Shillien Knight, Bladedancer, Assassin, Abyss Walker, Phantom Ranger, Duelist, Dreadnought, Phoenix Knight, Hell Knight, Sagittarius, Adventurer, Evas Templar, Sword Muse, Wind Rider, Moonlight Sentinel, Shillien Templar, Spectral Dancer, Ghost Hunter, Ghost Sentinel

Skill Upgrade

Lvl. to Learn	Skill Lvl.	Description	MP Consume	HP Consume	SP
5	1	Attacks the target's vital points with 73 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	8	0	1
5	2	Attacks the target's vital points with 80 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	8	0	1
5	3	Attacks the target's vital points with 88 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	9	0	1
10	4	Attacks the target's vital points with 115 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	10	0	1
10	5	Attacks the target's vital points with 126 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	11	0	1
10	6	Attacks the target's vital points with 137 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	11	0	1
15	7	Attacks the target's vital points with 178 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	14	0	3
15	8	Attacks the target's vital points with 193 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	15	0	3
15	9	Attacks the target's vital points with 210 Power added to P. Atk. Requires a dagger. Over-hit is possible. Cannot be used with Dual Daggers.	15	0	3