Neither. "Descent of madness" doesn't make sense. Also descending and down in one phrase is just redundant. Just use "Descending into madness" or "Spiralling down into madness"
Neither. The other anon who replied on this thread is 100% right and their versions given are the correct ones. The two versions you gave are profoundly incorrect, no matter what the other people who replied to this thread said. They're wrong.
Suffers from to much that already says the subject is out of control of himself. Descending /down spiral. Madness is defined not by the subject but an observer. His spiral (descent) into madness was swift/slow.followed by the signs. Just meant to be an example.
English grammar question!
Which is right?
1. Descending down the spiral of madness?
2. Spiralling down into the descent of madness?