Posting this for next year when I drop dragon to test out another style, and have to do this buggy quest alll over again.

The marching orders drop off of the invading orcs at the correct marker on your map you get with the quest.

Part 2:

The marker and compass are still bugged when trying to find the stone, it is really annoying cause it actually marks out a giant rock and you think you are in the right place (there is even this un-targetable npc at the top just to drive you even crazier.

The actual rock is a short distance from the Dragon style quest giver, just travel the road to the NW and the rock is on a little hill to the right of the road.  It is targettable, if you are having trouble finding it just walk along the road going out from dragon temple tabbing between targets.

Couldn't find this information anywhere on the web, and the quest nearly drove me crazy.  (for the 2nd time too, this thing has been bugged since launch).

But no one should play dragon monks anyways because they are horrible and smell bad... this is only for my reference in case I forget again.