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Eternal crystal detail

The eternal crystal is an add-on dropped by Cerberus. When used with a pair of infinity boots, eternal boots will be created. This process cannot be reversed, and requires level 60 in Runecrafting and Magic (boosts cannot be used), granting 200 experience in both skills.

Dropping monsters

Monster Combat level Quantity Rarity
Cerberus 318 1 4; Rare (1/512)
Enchant bolts

A player uses the crystal on the pair of boots, upgrading it.