Amulets comprise 1% of all randomly-generated items in the main dungeon, 1% in containers, and 4% in Gehennom. There is a 16.5% chance that a randomly-generated amulet will be an amulet versus poison, making it the second most generated amulet.
If you notice yourself surviving poison attacks unscathed, you know you must have a source of poison resistance. However, deliberately poisoning yourself is not a good way to identify this amulet.
This is an excellent amulet to discover early in the game, if you can identify it. It's quite common, and for this reason, you should wear uncursed amulets in the hope that a randomly found one might be versus poison.
If you know you have poison resistance through wearing this amulet, you can then eat poisonous corpses until you gain the resistance as an intrinsic. There is a specific message, "You feel especially healthy." to indicate you received the intrinsic while currently protected by the extrinsic granted by the amulet. This is useful to look out for as you can then dump this amulet in favour of other, more useful ones. If you play at night, however, try to hang on to the amulet in case a gremlin steals the intrinsic away.
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