I'm a streamer and I finished this game on stream recently and my veiwers laughed at Christoph's contstant line "I am weak with lack of precious blood." I was thinking of making it a sound redemption, but I couldn't find those files anywhere in the game files. Is there somewhere I can get his line whithout having to try recording it myself?

You need to extract it from the .vpk archives. In the patch extras there are tools for that.