No, it is not ‘obviously’ at all.
We know Zhaitan’s and Mordremoth’s two domains because they were told to us. Following the nickname of the dragons which is the first domain – Elder Death Dragon, Elder Plant Dragon aka Jungle Dragon – we can guess the first domain of the other four pretty easily because they have the same kinds of nicknames (Elder Fire Dragon, Elder Ice Dragon, Elder Crystal Dragon).
The DSD is not once called “Elder Water Dragon”. The DSD’s only nickname is in relation to its location. Deep Sea Dragon comes from the same coining that called Kralkatorrik the ‘desert dragon’ or Zhaitan the “orrian dragon” or Primordus the ‘rock dragon’ – it’s where they are not what their domain is.
Furthermore, the first domain – based off of the nicknames – is also the form in which their corruption takes shape. Plants, death/decay, ice, fire, and crystal.
The DSD’s corruption takes the form of tentacles as far as we are told. It corrupts water, but it doesn’t take the form of water – he twists water into tentacled creatures.
If we go off of that – our sole piece of information on the DSD’s minions’ appearance – then the DSD’s first domain is not water but tentacles. His nickname would be the Elder Tentacle Dragon.
That seems unlikely to me.
Whatever his domain is, it’s not water from what we know. Water is its location. Water is what it corrupts, not what it corrupts into.
So unless he corrupts water into corrupted water – entirely possible since Primordus corrupts fire into corrupted fire – its domain isn’t water. And even if it is, we don’t know that, because what we know points to “domain of tentacles”.
Adding to that Primordus is most likely using heat, not fire directly (don`t remember corrupted fire). His minions are molten stone, lava or magma (depending how deep we are under the earth
), so he is more alike to using heat energy. So him being part of the earth, rocks is certainly valid.
We see Kalkatorik using a lot of lightning and he creates crystals. He could be the crystal dragon, however what if the energy and heat of his lightning just manifests in crystal form, like when lightning hits sand and creates glass and other crystalin structures.
Though with theme I would have rather have him wield light and be more illusionary. The theme is just too perfect for it.
Overall, we can only asume many things, till they happen. They certainly don`t want to give us any hints on the DSD. They cut it out of the Crucible of Eternity, the secret room of the Priory and Glint and the Forgotten withold them in their little test.
Even the Raid is only speculation, based on a unintentional comment from a dev, which might mean something (tentacles) or nothing in the end.
I mean, by that logic and how that particular boss is wielding souls as well, DSD is actually based arounds ghosts and souls (which could be quite interesting. Zaithan brings back the dead to torment you, Mordremoth attacks your mind with your dead and Steve tortures their soul… hey Tybald, want to come around for a third round? )
Adding to that Primordus is most likely using heat, not fire directly (don`t remember corrupted fire). His minions are molten stone, lava or magma (depending how deep we are under the earth
I’ll admit that Primordus corrupting fire is a bit iffy, but I was getting it from how destroyers are formed in pools of lava (per EoD and GW1). In GW1 said pools of lava is different from all other lava in the game, being brighter and not having the same effect (only burning while all other lava burns and cripples).
Further, all of his minions and corruption results in fire and lava. It’s not just that he’s using fire to corrupt, it’s that his corruption takes the form of fire.
We see Kalkatorik using a lot of lightning and he creates crystals. He could be the crystal dragon, however what if the energy and heat of his lightning just manifests in crystal form, like when lightning hits sand and creates glass and other crystalin structures.
Though with theme I would have rather have him wield light and be more illusionary. The theme is just too perfect for it.
Kralkatorrik does use lightning, but he corrupted via a “golden gale”. His corruption can spread by crystals corrupting things by encasing them, lightning striking things, fire striking things, or wind striking things.
His first domain by all indication is Crystal.
And if Glint’s magic shows it well, his second domain is Sky/Air – which divides into wind, sun, and lightning.
Nothing about Kralkatorrik is illusionary. Nada.
Even the Raid is only speculation, based on a unintentional comment from a dev, which might mean something (tentacles) or nothing in the end.
I mean, by that logic and how that particular boss is wielding souls as well, DSD is actually based arounds ghosts and souls (which could be quite interesting. Zaithan brings back the dead to torment you, Mordremoth attacks your mind with your dead and Steve tortures their soul… hey Tybald, want to come around for a third round? )
All indication would point Jormag to being a domain over souls.
Zhaitan had imprisoned souls, however, so it wouldn’t be beyond the realm of the possible for other dragons to do the same. But Jormag is not only the only dragon to be tied to the Mists, but is the only dragon said to corrupt souls themselves.