Dropped on my second spawning of Garudon, he is trivial at 85 and 4000+ AAs.
Fight takes about less than five minutes. He doesn't hit hard and runs when low on HP, nearly all of my DoTs landed w/o resist except for the cold based attack slow that was resisted x3, not that it's even needed. Overall I did a few DoT's plus melee pet, couple of DD's later and a Remote Manaflux twincast w/ Sundew Blessing ended the battle and he dropped this for my ranger alt.
Now, I'm considering coming back to grab one for perhaps the monk and beastlord. Nevertheless, the drop for the dragonbone shard is tolerable but annoying. It does drop ONLY in the amphitheater as others stated below. It generally takes clearing the entire building 3-4 times to see one bone shard. That roughly translates to a 45min-1hr wait for 1 bone shard. So expect at minimum if camping straight to spend a few hours off and on collecting them.
Upon hand in, Garudon spawns down in the middle of the building, he is a belly dragon from what I noticed. So be sure to stand under him, he is also relatively small too which was a bummer. Expected more I suppose.
Edited, Sep 15th 2016 11:53am by LydiusInsidious