Leveling up for the bored and curious

[Star of Penumbra]

100% your normal movement range (like if you didn't have teleport)
-10%/15%(don't remember) for each panel you pass from your movement range.

It's 10%. To expand on this a little: Rama as a Squire has a base move of 4. With Teleport set as his move ability, he can move up to 4 spaces with no chance of failure. If he tries to move 5 spaces, then the chance of success goes down to 90%. If he tries to move 6 spaces, it goes down to 80%, and so on. Note that Teleport ignores height. In my current playthorugh, I have Teleport on Ramza and Move+2 on everyone else, though that's partially due to the fact that Move+2 is more useful for everyone else, due to the way they're set up.