Ring of vigour

The Ring of Vigour is a reward from Dungeoneering. You may purchase one for 60,000 Dungeoneering Tokens from the Dungeoneering Master, found north of Lumbridge and in Varrock palace. It requires 60 Dungeoneering to wield.

Uses
While wearing the Ring of Vigour and using any weapon's Special Attack, you will save 10% of your Special Attack. So if you would normally use 50% of your Special Attack, you'll only use 45%. The Ring of Vigour also gives a +3 Strength bonus, which is +1 less than a non-imbued Berserker Ring.

This item is commonly used by rushers in the Wilderness with a Korasi's Sword. This allows a rusher to get either 3 series of very quick attacks or 2 Magic attacks that are very likely to get a kill if the target is not using protection Prayers or paying attention.