What hides between Shadow and Light?

[Thomas]

I am awfully sorry, but there have been an error in the puzzle and it has now been fixed.

The line
8, 6, 9, 6, 11, 8, 13,
has been expanded to:
8, 6, 9, 6, 11, 8, 13, 10, 15, 8, 11, 4, 9,

Website has been updated...

Really sorry about this, no idea how I could have let it slip. Now I have gone over the whole thing several times and everything should be correct now. Next time I will not make such a complicated puzzle....

Because of this I want to give some other hints:
- The numbers in the sequences are not the that important. What is important is the thing that they lead to.
- "Silently evil emerged darkness" could have the word "snare" added at the end. Or even "sloth", "smear" and many others.

Again sorry for this great slip....