Danger level: ★★☆☆☆


The light-pulse vein, the river of light, the source of all life.

This is the source of all mushi power--and indeed, all life. Where it flows close to the surface of the ground, plants grow and flourish. Where it recedes, all life withers and dies. When mushi are weak, they glow more brightly because they are drawing power from the light stream. I'll talk more about them later.


Kouki in a special wine cup.

Drinking the kouki is a cure for certain mushi-caused ailments; it can also be used for a variety of other things, but it can be very dangerous in the wrong hands. It looks something like luminous sake (though since that's what the kanji that make up its name mean, this shouldn't be surprising).


Ginko sitting beside the River.

Humans can see the light stream sometimes if they have been influenced by the mushi so strongly they are almost mushi themselves, or if they close their second eyelid (Ginko knows how to do this).


A girl who looked too long at the River.

However, if one goes too close to the river of kouki or looks at it for too long a time, one's eyeballs can be eaten away by it.

The light-pulse vein is usually watched over by Masters or Gods; I'll talk about them later as well.