Erinix

Erinix is the first moon of Viga.

Craters
There is a lot of craters on Erinix, this is of-course caused by the fact that Erinix doesn't have a thick enough atmosphere as it has none to barely any.

Volcano's
It has 3 main volcano's that are 10's of km high and only 1 is very active due to that the stress seems to happen on it more.

Atmosphere
It has the thinnest atmosphere for a moon that has one making the day sky's black with the stars outside the system visible.

Trivia

 * 2nd smallest moon and 2nd largest moon of Viga.
 * Only moon with volcano's around Viga