Hydrix necklace

A Hydrix necklace is a necklace made by crafting a gold bar and a hydrix at level 90 Crafting, giving 135 experience. Enchanting it with Enchant Level 6 Jewellery (requiring 87 Magic) or the enchant onyx tablet will turn it into a reaper necklace, which gives best-in-class bonuses and "grants a stackable 'reaper' buff when you score a critical hit, granting 1% increase to attack bonus in all styles for 10 seconds, up to a maximum of 3% for 3 stacks." The plain hydrix necklace has no bonuses.