Warrior Ring

Occasionally infuses the wearer with "warrior energy" after slaying a monster.
Overview
The Warrior Ring is a craftable ring that becomes available after reaching Combat Level 4. Its recipe costs 10 Iron Bars, 25 
The buff stacks with other sources of Attack, including food buffs and other attack-boosting rings, making the Warrior Ring useful for players who want a simple damage increase during regular monster grinding or longer dungeon runs. The chance to trigger the buff is improved by Luck buffs from food and by Lucky Rings, but not by daily luck. Its proc chance is based on the formula 0.1 + (Luck Level / 100), so each point of Luck buff increases the base chance by 1 percentage point. For example, +1 Luck raises the chance from 10% to 11%, and +2 Luck raises it to 12%.
If two Warrior Rings are equipped, each ring rolls separately. If either roll succeeds, Warrior Energy is applied. This makes dual-wielding the ring more reliable than using just one, especially for players who spend a lot of time fighting groups of monsters.
The Warrior Ring can also be used for dyeing, where it serves as a yellow dye at the dye pots in 

Official description
Occasionally infuses the wearer with "warrior energy" after slaying a monster.