Ring of recoil

A Ring of recoil can be made by enchanting a sapphire ring. A player or monster attacking a player wearing a ring of recoil will find that one tenth of the damage they deal to the player will be dealt back to them. This will always be rounded up, so dealing 11 damage would result in a "recoil" of 2.

The ring will shatter after recoiling 40 damage total, which means that its usefulness is limited to opponents of low strength or of high defence. The cost-to-benefit ratio between the cost-to-create and the benefit-to-use dictates that this item is poorly utilized when dealing with most opponents. However, that is true mainly for players with medium and high combat levels. Many low-level players find the ring useful in many circumstances, as it helps them dispatch enemies quicker. Also, the cost factor is greatly diminished for those players with the mining, smithing and magic levels required to make the ring, as the cost is reduced just to time required to gather the raw materials, rather than a monetary cost.

One notable use of the ring of recoil is to defeat Koschei the Deathless in his fourth form, as he deals 1 damage every hit, resulting in an equal amount of recoil damage. It can also be used to kill Vyrewatch and strange plants. It is advised, when possible, to use Ring of Recoil against powerful quest monsters.

The TzHaar monster Tz-Kek, from the Fight Caves minigame, has a ring of recoil effect when attacked with melee, due to the high surface temperature of its skin.

Because no experience is awarded for recoil damage, skillers with combat level 3 (or low level) can use these to defeat various quest monsters. Killing a monster solely with recoils does count towards the player's slayer kill count, however with unagressive monsters the player must still entice the monster to attack the player, be it by casting a curse spell, or by hitting the monster with range or melee.

Some monsters are not affected by these rings, e.g. metal dragons. Contrary to popular belief, the Barrows brothers CAN be affected by them.

The method that the game uses to determine when a Ring of Recoil crumbles is: the Ring of Recoil being worn crumbles after 40 charges have been used by the player with any Ring of Recoil. In other words, the game remembers how many "recoils" have been used by the player on any Ring of Recoil and crumbles the worn ring after 40 have been used. Two points:
 * This prevents people from scamming others by selling Rings of Recoil which would otherwise only have a few charges left and also prevents the need for classifying 40 different Rings of Recoil (i.e. Ring of Recoil(28), Ring of Recoil(14), etc.).
 * Dropping a Ring of Recoil does not "reset" the next ring to 40. If you need a full charge, such as in expectation of a tough fight, you must use up the current charges first (by fighing something relatively safe that can still hit you). You could, of course, bring an extra ring with you, but this might take up valuable inventory space better used for good food. (It will also require you to remember to put on the new ring when the old one disintegrates.)