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Mockra has to be a Dragon. All of the Warrens are made from both Krul's blood and Dragons, right? Well, in that case, it makes sense that if a consciousness claims to be mockra, then its the Mockra Dragon, not K'rul. Because a warren can't be aware. I personally think Mockra is a Dragon with all the thoughts of everyone stuffed inside it, thats why it seems so arrogant, it truly is omnipresent.
Mockra is most likely not a dragon based on the conversation it had with Seren Pedac. I don't know the exact wording, but it tells her that Mockra is not really a specific warren, but the over-arching structure for ALL of the warrens. It tells her something about it being the language of the warrens due to the fact that in order to access any warren, there is an audible factor - ie, the caster must speak.(even though SE doesn't show that often, if at all). Therefore Mockra has a connection to each and every warren.
My internal picture of the warrens are a spiderweb(Mockra) that all of the other warrens are stuck to. I picture all of the warrens, in some way, shape, or form, going towards the center of the web, with Starvald Demelain being at the nexus.