Like many of its fellow normal unique weapons, Bladebone is unfortunately dated and often barely usable past early game.
Still, Bladebone has its uses. Like its name implies, Bladebone is more effective against Undead enemies. With both increased damage and attack rating against undead enemies, Bladebone is useful in Act I against enemies such as Zombies or Skeletons, in Act II the benefits really shine, since there are many Undead monsters around.
Bladebone also has a very small added Fire damage. Barely more than a chipped or flawed Ruby would bestow, the damage is only useful for early acts of Normal difficulty, after which it becomes antiquated.
Rather arbitrarily, Bladebone also gives a bonus to defense, which can be useful early game, especially when combined with a good shield.
One-Hand Damage: (6-7) To (16-19)
Required Level: 15
Required Strength: 43
Axe Class – Normal Attack Speed
+30-50% Enhanced Damage
+100% Damage To Undead
Adds 8-12 Fire Damage
20% Increased Attack Rate
+40 to Attack Rating Against Undead
(Only spawns in Patch 1.09 or later)