Amulet of ESP
Effects
An amulet of ESP grants extrinsic telepathy when worn, which will show all monsters with minds within a 10x10 grid, and all such monsters on the level when blind.
If you polymorph into a metallivore and eat the amulet, it will instead grant intrinsic telepathy. This takes effect only when you are blind, and shows all monsters with minds on the whole level.
Identification
This amulet can be identified easily with the far look command. If you notice a monster that you wouldn't ordinarily be able to see (e.g. on the other side of a wall), far look will tell you whether you are seeing it because of telepathy. If so, and you have no other source of extrinsic telepathy, it must be coming from the amulet.
Generation
With a chance of an amulet of ESP being generated at 17.5%, this is the most commonly generated amulet.
Strategy
Amulets of ESP are generally considered one of the best amulets, since having telepathy while non-blind is a very desirable ability. The amulet is particularly useful to spellcasting characters, since the other non-artifact source of extrinsic telepathy - the helm of telepathy - carries a hefty penalty to spell success. Wizards, Rangers, Archaeologists, Knights, and Tourists will all eventually find the amulet superseded by their quest artifacts.
Origin
ESP is an abbreviation for ExtraSensory Perception; that is, perception not gained through the body's physical senses. The term was coined by parapsychologist Joseph Banks Rhine in his 1934 book, Extrasensory Perception, and encompasses a number of purported psychic abilities, including telepathy and clairvoyance, among others.
See also
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