Rune javelin heads are items that can be made at level 91 Smithing, granting 5 javelin heads and 75 experience per runite bar. They can be fletched into rune javelins at level 77 Fletching when used with javelin shafts, which are made by using regular logs with a knife, granting 195 experience per 15 javelins made. However, fletching javelins decreases the resale and alchemy values significantly.
As a standalone item, rune javelin heads are a profitable way to use high alchemy due to their low cost on the Grand Exchange, which easily offsets the price of Nature runes when converting them into coins.
Smithing
Anvil
One rune javelin head
Two rune javelin heads
Three rune javelin heads
Four rune javelin heads
Five rune javelin heads
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