What hides between Shadow and Light?

[Kedjane]

So, what do we know?
The first part is an all-anagrams... anyone has any clue what the T -> B, C -> C, Q -> H part might mean? We're not supposed to exchange Ts with Bs at least (notably there are only two ts in the final text). Some people have looked at the letters respective numbers, what did you get from that?

Silently evil emerged darkness.
3, 9, 7, 4, 8, 9, 5, 7, 11, 6, 6, 13, 7,
8, 6, 9, 6, 11, 8, 13,
That's probably the part we should look at right now, in case we need to understand that before solving the text.

- The hints outside the puzzle (in one trailer and on website) are important leads, but not needed for solving.

Anyone knows what these are?

The Vernam part however is an anagram for: Self-valued, sparse romancer...? That might not be right...