Nexus Dragons are massive, volatile beasts surging with magical power. Each half of a Nexus Dragon’s body is infused with fire or ice mana, and it is believed that the unstable nature of these paired elements drives the dragon mad as it grows in size and strength. They are strict carnivores, preferring to feed on dragons and other creatures that naturally possess magic in order to bolster their own stores. As Nexus Dragons age, fire and ice mana crystals grow all over their bodies, enhancing both their power and viciousness.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Two-headed dragons are unique enough to deserve a separate classification from ordinary dragons. They have two necks, two brains, two mouths, but one stomach and one main body. The two heads usually work together, but there are times when they will fight each other, snapping back and forth. Their unique anatomy prevents them from breeding with single-headed dragons.

Sibalir and Sianir are notorious serial offenders. They have no established residence—like most Archanean Nexus Dragons—and have, over time, been prohibited from many locales for crimes ranging from theft and arson to outright murder and the destruction of entire establishments.

The siblings, as par for the course with Archanean Nexus, dubbed each half of their bodies 'vessels' for the type of mana they carry. Sibalir, the fire vessel, is a calm-headed and plotting individual like her sister. Sianir, with her control over ice mana, is equally cunning. Every day they grow more and more insane, hunting down all manner of traveling dragons, launching unprovoked attacks on settlements and following a gradually spreading Dolhr invasion like vultures. The bounty on their combined heads is huge, and the outcry for the Nexus Dragons' eradication from the territory surely means the sisters' years are numbered.