Tsera Energy

Tsera Energy is an invisible form of energy that flows throughout the four Worlds. The source of this energy is unknown however the end of Volume 1 reveals that the Tsera Rune this energy.

Tsera Energy Flow
Tsera Energy flows throughout all of the worlds however it’s potency decreases exponentially for each Midway it flows through. At it’s full strength Tsera Energy has a huge impact on the environment. Places where this energy is the strongest, (such as Dreghulan) Tsera Energy is observed to overpower fundamental forces of nature, causing extreme physical distortions. However as the energy grows weaker, its impact on the environment grows less and less noticeable.

Impact
The impact of Tsera Energy can affect geographical features and organisms, usually causing them to be more extreme. Dokulan is very mountainous and the geography is much more extreme than that of Marilan and Kailulan, this is due to Tsera Energy. Distortions can also happen to organism, however just amplifies a populations traits gained by natural selection. Since the geography of Marilan is similar to Kailulan, the population of flora and fauna tend to be similar, however in Dokulan, all flora and fauna is much larger. This also applies to the Alvish, as they are adapted to harsh environments, causing them to have larger eyes and on average more muscle mass than Akkidans and Corcillonians.

Utilization
People who have had exposure to Tsera Energy can manipulate and control its power via a Sixth Sense. This ability grows stronger in places with stronger Tsera Energy. Use of this  ability, however, comes with two catches. The first is that most people can only draw upon a fraction of the available Tsera Energy. This means that the extra needed energy to complete an action must be drawn from somewhere else. For example, if a user were to spark a fire using Tsera Energy then some heat would first need to be drawn from an outside source, cooling it down. This is known as the Cost of a spell. People well practiced in using Tsera Energy can learn to draw on more of the Runic Energy and minimize the cost, however this is difficult on the mind. This leads to the second catch. Using or being exposed to lots of Tsera Energy at once can lead to Tsera Sickness. The effects of Tsera Sickness can range anywhere from mild nausea and confusion, to complete loss of senses or corruption.

Balance
Because Tsera is such a powerful energy, it was forced over time to reach a perfectly equal balance in order for anything to form. In the case of Dreghulan, a slight imbalance of this power was what led to its chaotic ecosystem. Each world that has a flow of Tsera energy was formed with a slight imbalance of forces. The only world that is truly perfectly balanced is Kailulan, which has no natural Tsera Energy flow. Because of this, Kailulan acts as an anchor for the other worlds that prevents further collapse of the energetic balance. All life forms also contain a sort of energy that acts as an anchor for Tsera. This is why life forms are capable of manipulating Tsera Energy. If a life form dies or interacts with a lot of Tsera Energy, its anchoring force grows weaker. This is usually insignificant, however if this happens to many thousands of life forms at once, it can have a significant impact on the balance of power.

Ecological Disaster
In the beginning of Volume 1, a mysterious disease sweeps through a once powerful empire, reducing their population tenfold and forcing them to leave their land behind. Later into (Either volume 1 or volume 2) it is revealed that this great plague was transferred through a Midway from Dokulan directly to Kailulan. A large amount of Tsera Energy flowed into the world before the Midway was closed, interrupting Kailulan's perfect balance. The plague also caused hundreds of thousands of deaths all at once, which caused the balance to drop even more. This would cause a chain reaction that affects not just Kailulan, but all 4 of the worlds. As Caethea explains in Volume 2, a Tsera imbalance would cause problems that are so unnatural they would be difficult to notice at first. The first case of this in the story is in Volume 1, which the old Emporer has a 'vision of the future' in which a large number of people would need to leave the empire at once. This prediction later comes true as the refugees of the plague gather around the docks with nowhere else to go. Later, the path of the oceanic and wind currents are slightly altered by the Tsera imbalance to flow towards the sealed Midway, where the Tsera Energy is ever so slightly stronger. As more air and water is displaced, a powerful sea storm is created that pulls Corrin's flotilla of ships off course and towards what would be later known as Corcillon. The disaster continues to affect the story throughout the rest of the plot, until the very end which Kailulan's Tsera energy is brought back to balance through use of the Tsera Rune. As the divide of power grows progressively stronger, some effects even begin to show up physically with bits of the landscape being moved around or even seemingly removed entirely. This would mostly be noticed during the middle to the end of Volume 4 and would show how all of the worlds' ecosystems are slowly becoming more and more similar to Dreghulan.