Some monsters possess a passive attack - it is used automatically in retaliation to a melee attack against the monster. They can be avoided by use of ranged weapons, polearms, or being resistant to the attack.
The most infamous example of such a passive attack is the floating eye's paralysis gaze - hitting a floating eye normally paralyses the player for a period of time, during which they are vulnerable to outside attack - a cause of numerous YASDs. Other well-known examples include the various jellies, puddings, molds and acid blobs.
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