Alright, I'll try and compile all the useful information about Chapter 5 into one one post for anyone that is stuck/doesn't want to miss out on content. Chapter 4 was relatively short and straightforward, this one is anything but. Strap in, lads and lasses!
Thanks to Vae Victis and all the other great people from the Crimson Keep Discord for providing additional information! An anonymous user also provided optional boss strategies and the location of the last charm(also pointing out that Lyn is a fox, not a cat. My bad...), while
り乇ᄊの刀 ズノ刀ム 尺ム刀ᄃ乇 shared the crafting recipes.