Kurokami: Black God glossary
Alters are subs who failed to die, after meeting their duplicate Doppeliners. They are highly likely to die, since they are fated to die under the Doppeliner System. While they live, they spread bad luck to all those around them.
The Doppeliner System is the system set up to keep humans in balance with themselves. It creates three doppeliners, three people who look exactly the same as each other, who share luck between them, and two of whom will die to leave all their luck to the remaining third, when two of them meet.
Exceed is an ability of mototsumitama used in fighting, it consumes Tera to power the attack. Once Synchro has been initated, exceeds get more powerful, through the transfer of Tera from the partner under Contract. Each Mototsumitama has a unique Exceed, and some may be dangerous to their partner due to the high use of Tera.
Mototsumitama are the guardians of the tera flow of the Earth. They maintain the balance of the Coexistence Equilibrium system, and ensure the Doppeliner System functions as it is meant to. They are spritual creatures who are divided into clans.
Negative Roots (Minus Root) are Doppeliner Alters who outlive the primary Roots and where the other #Sub or Alter does not live either. They are also part of the Doppeliner System. Like alters, they emit great amounts of bad luck. However, due to their state, they have Negative Tera, in other words, they absorb Tera in order to live, so become tera sinks. If they do not absorb tera, then they die. A contract formed with a negative root will allow the contracting mototsumitama to absorb tera energy attacks of other mototsumitama, acting like a science fiction shield.
Roots are Doppeliners who have the primary share of luck and Tera of the three under the Doppeliner System. When they meet their other doppeliners, or Subs, the subs die, and the roots inherit their luck.
Tera is a type of spiritual energy emanating from the Earth, which brings luck, good and bad, and is controlled by mototsumitama through the Coexistence Equilibrium to maintain the balance of the world, so it does not fall apart.