The Wizard can be fooled into stealing a fake Amulet of Yendor if you are wearing it instead of the real one, but this only works once.

The Amulet of Yendor (and fakes) should have some bright, noticeable color that is not the same as the metal color used by every other amulet type.

Tourists encounter a new shop, a gift shop, on dungeon level 1, possibly built around the entrance stairs. The gift shop stocks mostly useless items like fake Amulets of Yendor, juice and candy bars at high markups, plastic figurines of low-level monsters, and T-shirts (which are much less of a big deal to the Hawaiian-shirt-wearing tourist).

Only for Tourists, general stores occasionally stock unidentified fake Amulets of Yendor.

Tourists start the game with a fake Amulet of Yendor, or else have it pre-identified.

A new game ending where you can take an fake Amulet of Yendor into the Planes. This is only achievable by having your fake Amulet be unidentified, and have some combination of high Luck, being crowned, and high alignment record. The idea is that your god is so blinded by your excellence that they allow you into the Planes without checking that the Amulet is real.

In the Planes under this scenario, the Wizard’s harassment stops (if indeed he was harassing you at all; you don’t need to kill him or do the invocation to get into the Planes under these conditions).

When you get to Astral and offer the fake Amulet, you trigger a different ending in which your mistake is realized and you are condemned to become one of the player monsters roaming around on Astral until the hero with the real Amulet shows up.

When you escape the dungeon by leaving on the level 1 stairs without the Amulet, your god is immediately set to be angry at you (for abandoning their mission). This will have no effect on the game since it’s ending, but end-of-game enlightenment will show that they were angry with you. Possibly disable this if the hero had the Amulet at some point or is carrying an unidentified fake one.

Wearing a cheap plastic imitation of the Amulet of Yendor gives you the sucker markup in shops.

Assuming an implementation in which player monsters can steal the Amulet of Yendor from you: they may instead steal an imitation amulet you are carrying in main inventory.

Up for debate whether they should have, say, a fixed 50% chance of stealing the real Amulet regardless of how many fakes you are carrying, or whether they should pick one of your apparent Amulets at random, which would give an advantage to carting around more fakes.

Placing a fake Amulet of Yendor into any container blows it up.

Artifact chaotic amulet Amulet of Splendor: provides every single amulet effect, as well as unchanging-ignoring controlled polyself when invoked. Wearing it conveys life saving (this WILL disintegrate the amulet if triggered), magical breathing, unchanging, poison resistance, ESP, reflection, strangulation (doesn’t kill you due to magical breathing but maybe it makes it so you can’t eat food or something while wearing it, or it autocurses), restful sleep, and gender change for as long as you wear the amulet. Base type is a cheap plastic imitation of the Amulet of Yendor.