Erosion

Item damage is an attribute that can apply to some items depending on their material. The performance of a degraded weapon or piece of armor will be degraded - weapons will have their damage decreased and armor's effective AC bonus will be reduced down to 0 (excluding enchantment). The following types of damage exist in nethack:

Rust affects only items made from iron. It results from exposure to water (by potion, fountain, pool, etc.) or to a rust monster.

Corrosion affects copper or iron items. Exposure to acidic environments (potions or some [[monsters) results in this form of damage.

Burning affects any organic material or plastic, and results from e.g. fire traps.

Rotting also affects any organic material and most commonly results from exposure to brown puddings.

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