Sliming

Sliming is the process of a character turning into green slime as the result of either the slime's attack or using a biting or engulfing attack against them. It is a slow process - you will have nine turns to take action against it if it is induced by a the slime's attack or biting attack and four turns if by means of engulfing a green slime.

Resistance to this is granted by the amulet of unchanging or by polymorphing being a green slime.

Once started the process can be stopped by either meeting one of the two conditions above or by burning away the slime (either by being hit by a fire-based attack, such as zapping oneself with a wand of fire or reading a scroll of fire, or by polymorphing into a fiery monster). Prayer is also effective at removing slime, and an amulet of life saving will save you from the end result.