Ring of warning
Wearing a ring of warning gives you the warning property. It is easy to identify; simply wear it and go to a dungeon level with monsters that you cannot directly see. The warning will cause them to be displayed as numbers (or colored question marks, if playing with tiles).
Warning is a valuable property to have; while it does not explicitly reveal the identity of the creatures a la telepathy, it has a larger range than telepathy, and works while unblind unlike intrinsic telepathy. Telepathy also does not sense mindless creatures like undead, whereas warning works on all but monsters of level 4 or lower. However, several roles get warning intrinsically as they increase in level; for them, a ring of warning is obviously useless once they reach that point.
Wooden or metal rings of warning can be eaten to acquire warning intrinsically.
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