I know I've started speculations about that long time ago but last night got a revelation. I launched myself ingame to rewatch the visions of the all and cinematic about the deep sea dragon. And here is what I've come with:
Named the 3D test "axolotl dragon" strangely, it looks like toothless. The one from the left is what I've seen with the vision within the story. Just think the body is bulkier than the drawn one. (speak of the right one)
I just Imagine it with an axolotl face, oriental flying gurnard lateral fins, spiky ray type tail and several bio-luminescence due to the deeps like that light spike on its head.
I also thought a lot about the infinity coil blue zone, the trials within Tarir. What if deep sea dragon minions are, simply, water elemental/ creatures made fully of water? This way impossible to see them. My guess is that the Aquarium within the crucible of eternity isn't empty, it's just all those big elemental are invisible to us, until we go in it and got killed. Imagine that the minion is just a body of water like a waterfall, a lake or anything similar or "bubbles" of water within waters.
We haven't seen them when Kasmeer trained the cubs in grothmar, during Tarir Trials, we just saw geysers. What if, they can't survive out of water? Moving only through their own fluid, water? I think it may explain the design of zone blue, the ground is water to allow that elemental/creature to move through it to reach the aquarium. But it would explain the issue with the size told by the water lead scientist if that creature can't modify its conformation. The second idea would be that those creatures looks like ocean inspired stuffs like corals, tentacles, shells or whirlwinds etc but camouflage themselves by erasing themselves from our sight, so manipulating our vision to make us only see water.
But I'm more for my first thought, the dragon manipulate water elemental which are just water within water so we don't see them, they can kill without being seen. I can understand why peoples would flee it if they are becoming paranoid about that. (you are in water and you are lacerated and hit without seeing anything) just see above or imagine chaos in sonic. (http://info.sonicretro.org/images/7/75/SA1PerfChaos2.PNG) . Imho it would explain the fact we don't have anything from them. Apart if they are going to the surface of the water, you can't see them and their 3D shape. Karkas aren't the minions, Largos obviously not, I could have thought about quaggans (looking at their angry appearances), but I think it's even more vicious than inoffensive looking quaggans, as said waters within waters.
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