When an artifact wish fails due to the artifact already existing, communicate this clearly to the player, and then let them use the wish for something else.

Remove the random element of artifact wishes. In each game, you can either wish for one quest artifact, or up to three non-quest artifacts, which you are guaranteed to get on the first attempt. Artifact wishes beyond that will always fail.

When an artifact is destroyed, unset it as existing so that it can be gifted or wished for again.

If an artifact has been generated and is on some existing level, wishing for it will remove it from that level and teleport it right into the player’s hands. However, the beatitude, enchantment, and other fields of the wish will fail.

Failed artifact wishes give you the base item type instead of nothing.

Wishing for an artifact drains two charges from a wand of wishing. If it’s a wrest wish or from a source that only gives one wish like a djinni, you merely get the base item type instead.