Dracula's riddle 2

[CidApollyon]

Shot in the dark, but I do hope someone's still playing (especially with Chapter 5 open for free since a few months back).

Any help for A3, B1, B4, C4, D3, E1, E4? Thanks!!

For D2:

What he did after the pain got to him is important. Somehow stumbled into the right one from there.

[randomyoshi314]

Most people will probably not even see this because it's such a late reply but I'll try anyway. I'm stuck on A5, D3, and C5. Here's what I've figured out so far.

I've completed step two, but step one is mysterious. I found a strange anagram but it hasn't helped.

I think I've figured out what the second and third sentences mean, but the first one eludes me. Both the second and the third one referenced something with red, so I've been using that to sense for deductions.

The ambiguity in the rotation of the N, plus the non-standard Π with an arrow above it means I don't even know how to start. Also it doesn't help that the size of some of the letters can be two things, it seems like. I'm fairly experienced with mathematics, I just don't even know how to interpret a product with an arrow above it. I have figured out what IQ -> M means though.

[riddlemaniac]

Aybody here still active ?? Would love some help for Chapter 5!!!!