The Marat are partially descended from primitive LOTR elves, e.g. The Avorren, or a group who had just awakened and got sucked into Carna
The Canim, thanadents, and numerous other creatures native to the world of Carna are descendants of various prehistoric creatures from our world.Word of God has already established that several creatures in Carna, such as the gargant, herdbane, Marat, and leviathan are all descended from prehistoric Earth creatures that got sucked into Another Dimension and became established there (ground sloths, terror birds, Neanderthals, and plesiosaurs, respectively), much as the Alerans did. It is quite possible that other creatures in the series that are not immediately recognizable as modern Earth creatures could have a similar ancestry. The thanadent is described as having feathers (as worn by one of the Marat), as well as sharp teeth. This information would seem to suggest it is a theropod dinosaur, more specifically either a basal coelurosaur, a tyrannosauroid, or perhaps some sort of maniraptoriform. In-novel, the Canes are described as sort of like a wolf, but at the same time rather unlike a wolf. A possible ancestor can be seen in the prescence of Tavars, a species of predatory animal that is described as both wolf and weasel-like, which seems to suggest they are descended from amphicyonids, or bear-dogs, animals that are oftentimes described in the exact same terms. The fact that Tavars are highly intelligent and native to Canea suggests that Tavars and Canim share a common ancestor, sort of like how humans and the great apes do. It is also possible that slives could have an origin in our world, possibly descendants of one of the Cretaceous species of venomous monitor lizard. The Vord, though, are most likely Starfish Aliens who fell through from their homeworld, if not from another Another Dimension entirely.
One of the primary differences between Carna and our world is the fact that energy can be transferred more easily between objects in that dimension.All of the major sentient races in Carna have powers which are not present via their counterparts on Earth (if the Alerans are any indication). These powers are all very similar, and oftentimes involve transferring their powers to one another. Alerans get their powers from their furies, which are sentient embodiments of the elements who give power to them. Marat get power from their chala, who are living creatures which give them power. Canim blood magic seems to draw power from other members of their own kind. Heck, even the Icemen could be considered as falling under this, as their telepathy could be due to Icemen sharing energy with one another for communicative purposes. All of this could be explained by Carnia having different physical rules than our universe, specifically allowing for the easy transfer of energy from one source to another. This allows organisms to share energy, and utilize new powers and methods of survival inaccessible to creatures that live in our world.
A group of Alerans will eventually fall through a portal to Earth.After all, if things can come to Carna, who's to say that things don't come from Carna? This could explain the multiple instances of the Marat fighting the Vord; it's a battle that taken place across the different dimensions that groups of Marat and types of Vord have inhabited over thousands of years. One would wonder if an Aleran's furycrafting would work on Earth.
The Vord are TyranidsThe current Queen is a particularly powerful and independent Synapse Creature who was thrown out of a hive fleet for being too interested in her food.
This series and The Dresden Files will cross over more traditionally.After all, there has to be something beyond the outer gates. Fanon already says it's other planes.
Gaius Sextus and Alera were more than just partners.Seriously, Gaius was married to a beautiful young woman but showed her next to no attention, not even to try to produce heirs. That makes no sense until we realize that he had the power to summon an inhumanly beautiful, intelligent, witty female fury into existence whenever he wanted.
Septimus was the son of Gaius Sextus and AleraNote that the characters remark how utterly diffirent Septimus was when compared with Gaius. Also, Alera's last words to Tavi are that she - the discrete entity that is Alera - will be with Tavi and his children forever. What if she means that they carry part of her because she was Septimus' mother? It would explain how utterly badass both Septimus and Tavi are, if they've got a bit of Alera itself running through them....
Aleran crows are clairvoyant.Otherwise, why would they show up before battle is even joined? They're not following the armies, since they don't seem to be in evidence during normal troop movements.
Gaius Primus is Gaius Julius Ceasar or some relative of his.In the prologue for First Lord's Fury Varg is reading a book by a man named Julius who is the commander of the legion that ends up stranded on Carna.
On the opposite side of Carnia from Alera and the Canim continent is the Avatar continents.It makes sense; bending and furycrafting are simply two different aspects of manipulating elements. The Avatar world simply hasn't had anyone learn how to bend plants because they haven't found a spirit/animal that can do so. Of course, this does mean that sooner or later, the Avatar world is going to have to deal with the Vord.....
A sequel series set 100 years after First Lord's Fury will involve Giant Mechas fighting the Vord.It's a hundred years after merit based furycrafting is introduced, which means a few generations of Tavi-like people have been running around creating a techno-crafting revolution. The technology of Alera will skyrocket far faster than on Earth thanks to the merit based furycrafting and the threat of Vord invasion. The furycrafting will allow the Mechas to work despite the Square/Cube Law, and in preparation for the Vord in Canea the alerans will load the Mechas with every type of weapon available. And it will be awesome.
Carna is a popular dueling ground for Planeswalkers, perhaps even a tournament.Each race is a Planeswalker's preferred deck theme. Those wiped out could be loses in the tournament. Building from this, Alera's change to merit-based furycraft, something that felt rather deus ex machina to this troper, is Wizards of the Coast releasing the next expansion.
Tavars are actually honey badgersThey're just larger and have adapted to colder weather. The resemblance is uncanny.
The Vord copied their telepathy from the MaratDuring the first appearance of the Vord they display little to no furycrafting capability relying on physical power and Hive Mindiness. When they next return in Priceps Fury they begin to make greater use of furycraft and by the final book the primary Vord Queen has become the most powerful crafter in the series. The Vord in Canea however show no such ability because they were born after the Vord Queen fled Alera (and so have never been in contact with furycrafters before Tavi). We know that the Vord have encountered the Marat on at least one occasion in the distant past so it's no great stretch of the imagination to assume that they 'copied' their abilites, indeed the comparison between the Vord and the chala bonds of the Marat is directly disccused.
The Marat inadvertently created the Vord, or at least TakersThe key here is Doroga's description of first contact. The Marat met "A creature", and the description of events is heavily intermingled with references to Marat bonding. Furthermore, the original Vord apparently hijacked Marat women as incubators, and nothing similar occurs during the Vord invasion of Alera, nor is it mentioned in Canea. So, here's the theory: 1. A Marat attempts to bond with a Vord queen (probably it either looked sort of like the Aleran queen prior to getting blood samples or like a Vord beetle warrior) 2. The queen destroys the Marat's mind, and gets Marat traits 3. The queen also obtains Marat blood, and grows into a Marat-like form 4. The queen manages to produce Takers using the blood as a base 5. Taken Marat provide the first generation version of the hives that provide the Vord swarms during the Aleran war 6. The Vord obliterate the Marat 7. The Vord become a Horde of Alien Locusts, and finalize the system they use during the series at some point after the last war with the Marat (hence why the Wax Forest was left alone; the Marat would never have missed such a heavily infested zone intact if they'd encountered it before)
The Marat and the Vord originated in the same dimension.It seems fairly obvious, since the Marat have fought the Vord three times prior to the series — and given what the Vord did to the Canim, and that the Marat civilization got smashed down into a few surviving barbarian groups, it's unlikely that the remaining Marat managed to reduce the Vord to the single hibernating Queen. It's more likely that the Marat and the Vord originated on the same world (or, possibly, that the Vord got phase-shifted to the Marat world, much as the Marat came to Carna), and that the Vord drove the Marat off a couple of continents there before both peoples came to Carna. There may have been one fight against the Vord on Carna, but not more than that.