Leo Ring

In Game Description
One of the special rings granted to the four knights of Gwyn. The Leo Ring belonged to Ornstein the Dragonslayer. His lugged spear is said to have sliced a boulder in two.

Availability
Game version 1.03 and older: During the Dragon Slayer Ornstein & Executioner Smough boss fight, kill Ornstein first and collect the ring After patch 1.04/1.05: Kill Executioner Smough first. At the end of the boss fight Ornstein should leave the ring behind.

Use
Strengthens counters with Pierce Weapons
 * Does not affect critical hits (backstab & riposte: try the Hornet Ring) or striking a recoiling opponent (you have broken his guard, kicked him, or blocked his attack and caused him to stagger).
 * To perform a counter, strike an opponent at the same time his attack would have hit you or IMMEDIATELY afterwards, before they recover from the "peak" of their attack animation.
 * Normally this gives a ~20% physical damage bonus when using a weapon that is capable of counter attacks. The Leo Ring boosts counter damage by approximately 40%, for a total of ~67% greater power than normal.
 * Counter attacks only give a bonus to physical damage, so the effect is weaker with elemental, magic/enchanted, and divine/occult weapons. The pure magic Moonlight Butterfly Horn cannot deal counter attacks at all.
 * Confirmed counter attack weapons: Thrusting Swords, Spears, some Halberds (Scythe does not work but Lucerne and Gargoyle Halberd do, for example), Straight Swords and Katanas of all sizes that perform a thrusting power attack, Arrows
 * The damage boost applies for almost every enemy in the game, including bosses and large foes.