ブラッドウェポン [blood weapon] in Japanese.
Final Fantasy XI
Type: Special Ability
Learn at: DRK1, Use: DRK
Cast Time: instant, Recast: 1 h, Duration: 30 sec
Range: self, Radius: self, Cumulative Enmity: 1, Volatile Enmity: 80
Description: Allows you to drain your target's HP with your melee attacks
Other: amount drained equals the damage dealt, doesn't work on the undead
Other: can be modified by Abyss Cuirass +2
A Realm Reborn

Type: Dark Knight Ability
Learn: DRK18, Use: DRK
Cast time: (instant), Recast: 60 s, Duration: 15 s
Potency: -, Range: 0, Radius: 0
Description: Increases attack speed by 10% and converts physical damage dealt into MP, while reducing weaponskill TP cost by 20%. Cannot be used while under the effect of Grit
Other: modified by Clean Weapon
Final Fantasy Tactics
Type: Darkness, Element: Physical, MP: -
Target: any, Range: 3 horizontal, any vertical, Radius: 1, Power: 0
Speed: instant, Duration: -, Line of Fire: No
Learn: Dark Knight (500 JP)
Incantation: "Oh blood-soaked sword, release the wave of darkness! Sanguine Sword!"
Effect: Deals non-elemental damage and drains HP from target. 100% hit rate.
Other: can only be used when equipped with a sword, knight's sword or fell sword. When Dual Wielding, only the upper slot counts for both this and the damage calculation
Other: HP Drained = 0.8 x Phys ATK x (Weapon STR + Power)
Other: as 'Sanguine Sword'
Explorers
Type: Sword Skill, Equip Load: 30, AP Cost: 110
Target: immediate front of the user, Power: 50, Element: 100 Thrust
Cast time: ?, Recast: 10 sec
Learn: 500 CP, Specialty: Knight, Paladin
Unlock: unlock Knight
Description: A thrusting attack that drains the enemy's HP. HP drained rises if Deflect is used to defend immediately before
Record Keeper

Type: Soul Break, Rarity: -
Target: single, Element: -, Gauge cost: 1 bar
Learn: Cecil Harvey (Dark Knight) (default)
Description: Drains the target's HP
Category: Ability