Bloodletter is a unique Gladius from Diablo II: Lord of Destruction.
Bloodletter, an exceptional unique item, gives more than decent damage for a one-handed sword, with a very high enhanced damage plus an added base damage. Combined with an increased Attack Rating and Attack Speed, Bloodletter can do major damage.
Due to the nature of its skill bonuses, Bloodletter is generally meant for Barbarian use. Since many high-level Barbarians often choose to put levels into Whirlwind, Bloodletter is a good weapon for those Barbarians, as it also gives a large boost to Sword Mastery.
On the other hand, Bloodletter is a Gladius - some Barbarians may dislike using Whirlwind without the extended radius of a long weapon such as a Spear or Polearms. The bonus may make up for it nonetheless.
Bloodletter also has several other bonuses. Although its slower Stamina drain is most likely pointless, since most heroes would generally put many points into Vitality, its life leech is useful. When using Whirlwind, Barbarians put themselves in close proximity to enemies. In Nightmare and Hell difficulties, when enemies do much more damage, life leech is often necessary to survive a mob.
Stats

Bloodletter
Gladius
One-Hand Damage: 31 To 97
Required Level: 30
Required Strength: 25
Durability: 54
Sword Class - Fast Attack Speed
+140% Enhanced Damage
Adds 12-45 Damage
+90 To Attack Rating
20% Increased Attack Speed
10% Slower Stamina Drain
8% Life Stolen Per Hit
+1-3 To Whirlwind (Barbarian Only)
+2-4 To Blade Mastery (Barbarian Only)
Normal Swords — Rixot's Keen (Short Sword) • Blood Crescent (Scimitar) • Skewer of Krintiz (Sabre) • Gleamscythe (Falchion) • Griswold's Edge (Broad Sword) • Hellplague (Long Sword) • Culwen's Point (War Sword) • Shadowfang (Two-Handed Sword) • Soulflay (Claymore) • Kinemil's Awl (Giant Sword) • Blacktongue (Bastard Sword) • Ripsaw (Flamberge) • The Patriarch (Great Sword)
Exceptional Swords — Bloodletter (Gladius) • Coldsteel Eye (Cutlass) • Hexfire (Shamshir) • Blade of Ali Baba (Tulwar) • Ginther's Rift (Dimensional Blade) • Headstriker (Battle Sword) • Plague Bearer (Rune Sword) • The Atlantean (Ancient Sword) • Crainte Vomir (Espandon) • Bing Sz Wang (Dacian Falx) • The Vile Husk (Tusk Sword) • Cloudcrack (Gothic Sword) • Todesfaelle Flamme (Zweihander) • Swordguard (Executioner Sword)
Elite Swords — Djinn Slayer (Ataghan) • Bloodmoon (Elegant Blade) • Lightsabre (Phase Blade) • Azurewrath (Phase Blade) • Frostwind (Cryptic Sword) • Flamebellow (Balrog Blade) • Doombringer (Champion Sword) • The Grandfather (Colossus Blade)