Sweet.
Fatiguing strike: Successive strikes are not cumulative. is that referring to the penalties not increasing, or does that mean that if you do it again after 8 minutes the counter doesnt start over with another 10 minutes?
Earthsense: Should work if they're standing on objects. otherwise a sules lawyer could argue that if they wear shoes earthsense doesn't work on them. or, they'll just stand on their shield or something.
and why does mountain use CHA for ability uses. should it not be Con? or at least STR?
and for Wind, the abilities that use Cha instead of Dex, should probably be using wisdom.
ohter than that, awesome. looks almost done.
oh, and maybe fix the spoiler box for the first few classes.