The Berserker ring is a melee strength ring with no requirements. It gives +4 melee strength and +4 crush defence. The Berserker ring (i) doubles both to +8, the second-highest melee strength of any ring in the ::bis list, behind only the Ultor ring (+12). Both are cheap: the Pk point shop sells the normal ring for 500 PKP and the imbued ring for 1,000 PKP, and both drop from bosses.
Crates and boxes: the Bronze Crate (from player kills and Crate Frenzy) and the Vote Mystery Box (Voting).
Starter kits: new accounts that pick the Main Pking, Pure Pking, Tribrid Pking or Pure Nh kit start with one.
Achievements: one ring each for Venenatis kills (30), Deep Wild kills (20 and 110), Hybrid kills (20, 800 and 1,250), Main Melee kills (20 and 35), Pure kills (35), Zerker kills (35), Overall kills (250 and 625), Bounty Hunter kills (1,000) and Win in LMS (6).
Crates and boxes: the Silver Crate, Gold Crate (2, noted) and Platinum Crate (5, noted), which come from player kills and Crate Frenzy; the Treasure Chest from Treasure Hunt (50, noted); and the Vote Mystery Box.
Achievements: one ring each for Venenatis kills (50), Chaos Elemental kills (100), Pure kills (110), Zerker kills (55) and Win in LMS (30). Bigger milestones give noted rings: Callisto kills (7 at 140, 15 at 800), Vet'ion kills (5 at 225, 5 at 600, 10 at 1,500), Venenatis kills (5 at 600), King Black Dragon kills (8 at 2,500, 5 at 3,500), Slayer tasks (20 at 475), and 2 each for Deep Wild kills (185), Killstreak Shutdown (100), Main Melee kills (475 and 1,000), Multi kills (1,000), Single kills (145) and Zerker kills (145).
In Last Man Standing every loadout starts with its own copy of the Berserker ring equipped. It has the same bonuses and only exists inside the minigame.