Earth build need help

Aftershock instead of crystal wave is a good idea if you think the exhaustion is too much. I notice you only have 7 skills listed. I would suggest glyph of energy. Cast it before OF and you won't have to worry about exhaustion. It makes each OF a bit "slower" due to the need to cast the glyph, but well worth it in a long fight where that much exhaustion is dangerous.

"Aftershock instead of crystal wave is a good idea if you think the exhaustion is too much."

Crystal wave doesnt cause exhaustion.

And kinetic armor=great skill.
Ether prodigy=great skill.
However they clash when you factor in the "lose all enchantments part of prodigy", and kinetic armor has an especially long cooldown and casting tiem, so it wont be able to be recast after casting prodigy. If you have factions, go second wind or energy boon, however if you plan to use obsidian flame often, use energy boon.

[edit]-And also, glyph of energy is an elite, so is prodigy.

Here's a build you might wanna try:

Glyph of Energy {E}
Earthquake
AfterShock
Obsidian Flame
Ward Against Foes
Ward Against Melee
Mantra of Concentration
Resurrection Signet

Earth Magic: 16
Energy Storage: 11
Inspiration Magic: 8