Maybe the location of the last orb changes, because while the first 2 were easy to find (and in the same spot deceptus mentioned), I ended up finding the 3rd one at ( 16.8 , 30.4 ) Z: -3.1 on a shelf, after a LOT of searching.
Is also needed for Nightsteel Ore and Silvergrace Ore.
This is the Stormblood boss theme. Can be bought with 50,000 MGP at Gold Saucer Prize Exchange II.
Would be pretty easy to solo as a level 70 DPS (ilvl 320) with healer bird, except for his move that inflicts Pacification+Silence. Even with that, I got him pretty low before dying.
Did you use Truth of Mountains? I forgot about that my first game day and had to wait around for the next one by the time I realized. x.x
Also found at Shisui of the Violet Tides by spearfishing. Large Gig.
Caught my 3 with only 622 gathering, right next to the quest NPC. No Snagging. One at ~5:50, another ~7:25, last one ~8:29. All with Fair Skies. I did have a decent number get away, but only went through 17 casts total, and I was catching some other fish too; not everything was getting away.
Goblin Jig is definitely the bait to use for these. I tried Purse Web Spiders first, caught one Rockclimber and about 15 Aether Eyes. Switched to Goblin Jig, 2 Rockclimbers immediately.
West Banepool (10,10) seems to be the best location for these. I tried Unfrozen Pond first, only got 1 in 21 casts (was mostly catching Abalathian Smelts). Went to West Banepool and the first 2 casts were Ice Faeries. This was using Caddisfly Larva.