Bone Javelin

Type	Weapon
Damage	20 (Ranged)
Knockback	5 (Average)
Consumable	✔️
Critical chance	4%
Use time	25 (Fast)
Velocity	10
Rarity
Sell	10
Research	99 required
Debuff	Penetrated
Debuff tooltip	Bleeding Out
Chance	100%
Duration	15 seconds
Use

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

Bone Javelins being thrown at a Target Dummy. Note how the damage over time increases once more javelins are attached.

The Bone Javelin is a consumable ranged weapon crafted from Sturdy Fossils. Upon hitting an enemy, it will stick to the enemy and inflict the Penetrated debuff, dealing 3 damage per second. Up to six Bone Javelins can be pierced onto an enemy, dealing a total of 18 damage a second. Bone Javelins stuck in an enemy will dissipate after 15 seconds.

Crafting

Recipes

Result	Ingredients	Crafting station
Bone Javelin (20)	Sturdy Fossil	Iron Anvil or Lead Anvil

Notes

Even though the base damage can be amplified with armor, accessories, and buffs, the continuous damage of one Bone Javelin will still be 3 damage per second.
Bone Javelins appear to have a strange effect on Granite Golems. When the Granite Golem turns invincible by crossing its arms, Bone Javelins will not do damage until the invincibility wears off, doing the damage via many 1s. It appears that the damage stacks over time, even while it is invincible.

Tips

The Bone Javelin is a great supporting weapon for bossing in pre-Hardmode, even after obtaining better weapons. Since 6 stacks are the maximum for the Penetrated debuff, landing 6 shots and changing to the main weapon with higher DPS will maximize the damage output.

Trivia

The Penetrated debuff can never be applied to players, so it lacks a correct debuff icon. It instead uses a duplicate of the Distorted debuff's icon.
Bone Javelins act similar to a Daybreak which both stick to an enemy and inflict a stacking damage debuff.

Immune NPCs

History

Desktop version

Desktop 1.4.0.1:
- Damage decreased from 29 to 20.
- Now crafted by 20 instead of 15.
- Weapon type changed from Throwing to Ranged.
- No longer works with Flasks and Magma Stone.