The mishap table for the teleport spell violates one of the unwritten rules for D&D: a higher roll is better for the person making the roll. So I have reworked the table so the person teleporting wants to roll high (instead of the current version, where you hope for a low roll, in a flashback to 2E weirdness).
Update: At the suggestion of Gaël Zimmermann, I've changed the False Destination entry so it's not a faked d%-equivalent roll. The version presented below is statistically equivalent to the original d20+80.
|Familiarity||Mishap||Similar Area||Off Target||On Target|