You can get it from the Barbarian Assault minigame. Imbued rings To complement your outfit, you can use an imbued ring: Berserker ring for melee, Seer’s ring for Magic, and Archer’s ring for range. You can obtain the rings from the Dagannoth Kings or the Grand Exchange, but you’ll...
and you don’t necessarily need a shield to have a good time in PvP, but it will make you feel even greater when you parry that pesky invader and get