In the 2024-April Elder manual you might also find some good information. There are several hits when you search the word (Blood) in this manual.
https://pdfupload.io/docs/bfbae26f
Let me see what else I can find. What is in this folder? OOP's that's my half eaten donut I have been looking for! Well, anyway, some of this stuff might help out.
Grandpa!