Online Dice
1d22 · one choice from 22 outcomes
A D22 fits a list with twenty-two entries without squeezing away its last two rows. Names, places, and discoveries all work well. The range is unusual; reading one numbered entry is pleasantly straightforward.

Suppose you have twenty-two possible discoveries. Put them in a numbered list and roll once. An 18 selects entry eighteen. Each has a one-in-twenty-two chance, approximately 4.55%, as long as each entry appears once.
Number twenty-two names, locations, events, or cards from a set you define yourself. A single roll chooses one numbered entry. If the list changes length, the custom-sided roller can follow it.
A D20 cannot reach entries 21 and 22. Choosing them with a separate exception after rolling a D20 usually makes the table uneven. Use a D22 directly, or decide on a valid rejection-and-reroll method before playing.
Twenty-two outcomes are more options than twenty, not inherently better randomness. Match the range to your actual table rather than choosing an unusual die size for its own sake.
The mean is 11.5. Neither central entry gets extra weight from its position in the list; each of the twenty-two rows still owns one possible face.