Ethri is a type of energy found in Universe X. It emanates from an entity called Tatsuonga within The Source, and can be found throughout the Lathrym (and even Ersis) in a number of forms. Arkn and Arkn half-breeds channel Ethri to practice a type of magic (known as Ethrial Manipulation), and most sentient beings (including Arkn, Dekn, half-breeds, and even Humans) can utilize Ethric energy to charge Siy. Both SEEKER and U.M.E.E.C. have developed technology based around Ethri.
Due to its supernatural properties and applications, Ethri is extremely valuable to both the Arkn and the Dekn; competition for Ethri is one of the main causes of the war between the two races.
During the creation of .Mainframe, a rebooted .Reality core was used to create a connection between the base and the universe on top of it. Alongside this, a split in the core was created to allow for the universe to be boxed in. This split core is was taken over by Fab'rasi, and became the Heart of Ethri (commonly known as The Source). Here, Fabras expended the last of its power to create Tatsuonga: the wellspring of all Ethric energy.
Exposure to Ethri (from the tear in the Silulis) caused half the humans of the Origin Seed to mutate into proto-Arkn, and granted them naturally-occurring Ethri in their blood. Evolved Arkn later discovered that they could charge their natural Ethri and channel Tatsuonga's power directly to practice magic. The Dekn, however, lacked this natural Ethri, and had to find an Ethric charge from an external source if they wished to practice Siy-based magic.
The Ethric Mind and the origin of Ethri is known to mortal beings only from scrolls and books written by Jacques. The Source is inaccessible, with no known entrances.
While Ethri itself is a type of energy, it can be be found in liquid, gaseous, and solid form.
Liquid Ethri is known as Ethric Fluid. In addition, ancient super volcanoes of Ethri (such as Mortavrest) can be found; these produce an Ethric Steam that can act as a charge, and even powers some tech in Mistria.Super-heated Ethric Fluid leaves behind a crystallized residue that is naturally charged with Ethri. This residue is known as Ethric Crystals. There are three types of Ethric Crystals:
- Natural Ethrics: These crystals are naturally charged with ethric energy. However, their energy is finite, and cannot be recharged. Often used by Dekn to charge Siy.
- Rethycs: Naturally empty crystals which can be charged and recharged. Will break after extensive use. Often used in U.M.E.E.C. and SEEKER technology.
- Nullithics: Crystals formed from Ethric Volcanoes that cannot hold a charge or be charged. Due to their durability and wide range of colors, they are often used in jewelry and other ornamental objects.
Ethric Crystals are extremely valuable to the Arkn and Dekn alike. They are used as currency throughout the Lathrym (as well as in transactions in Ersis). Ethrics used as currency are typically cut down into a small, pebble-sized crystals (as even a small crystal can hold a long-lasting charge); a singular crystal piece is called an Etherl, while multiple coins are known as Etherin. Larger Ethric crystals, which hold a stronger, longer-lasting charge, are often needed for magic-infused technology (such as Ethric firearms); however, these are far rarer and more difficult to obtain.
The Dekn Mafia made its fortune through the Ethric black market (and in fact established Blood Flags just to help them launder Ethrics).
Arkn have Ethric energy contained in their blood (i.e. their blood itself possesses Ethric properties). This gives them a direct connection to the Tatsuonga, and allows them to channel its power naturally. Arkn in the Lathrym practice magic by using Ethri to charge sigils and create auras.
Half-breed Arkn (or Hurn) do not have Ethric in their blood, and must channel Ethri raw. Because of this, they cannot reach the power of a full-blood Arkn, and cannot channel an aura without the use of Rethryc Crystals.
Dekn cannot channel Ethri, and so cannot fully tap into the Tatsuonga. However, they can tap into it mentally enough to draw sigils, which can be charged with Rethyc crystals to be activated (a form of magic known as Siy, which the Arkn also practice).