Is it just 1000 years per cycle, light and dark being split up in varying degrees, or 1000 years per cycle, 500 dark/500 light? I only ask this, because I forgot what our decision was.
I think it's the former. I think the dark could kill every single civilized being in 500 years, if that's how long the dark are supposed to rule. So it really doesn't make sense for the dark to rule 500 years and not be able to destroy everything.
And about the Myrkridia... Are they really a part of the dark, or are they neutral, like the Trow? It seems to me like the Myrkridia allowed people to live, though under extreme fear/oppresion (see myth 1 manual intro). And I thought the motto of the dark is "seeking not to conquer but to destroy".