Umbros are the physical manifestation of the dark feelings in humans' hearts. Every human has one, but other species don't, although they also have dark feelings in their hearts.
Umbros come in all shapes and sizes, depending on the human from which they originated. Some are as big as houses, others are the size of a mouse. They are released by reciting a formula and executing a ritual, which consists in splitting the soul in two. Once the ritual is complete, there remains an Umbro, the dark feelings, and a Luzo, the empty shell. Though not quite empty; the Luzo still has its own will and consciousness. Once the Umbro has been freed, it can never come back into the human's body.
The Umbro and the Luzo are tied, which means whatever happens to the Umbro also happens to the Luzo, and vice versa. If they get too far away from each other, they will start weakening, if they keep getting further away, they will both die. Therefore, it's impossible to see an Umbro without a Luzo, and vice versa.
The ritual to free an Umbro consists in drawing seven runes on the ground. Six in a circle of about 30 meters in radius, and one in the center of the circle. The distance at which the runes are from the center will determine how far the human and Umbro will be able to go from each other once it will be freed. The runes must be marked with specific things. One of chalk, one of ink, one of soil, one carved into the ground, one of charcoal, one of ashes, and one of the human's own blood, the one in the center. Each rune must be linked to every other with blood. The human who wants to proceed to the exfiltration of its Umbro must stand on the blood rune in the center, with several bone necklaces around its neck, one silver bracelet around each wrist, and a large black circle painted on the chest. The human must recite the formula, and the Umbro will come out from the black circle on the human's chest. After it is done, the necklaces and bracelets as well as the runes will be lost.
The first Umbro ritual took place about two centuries after the humans moved away from the Untari. The human who created the ritual was known as Darian Harth. He had wanted to create a way for humans to become pure, but he forgot that everything has to go somewhere, and thus came into existance the first Umbro known to mankind, Vescaro.
