Liber Falxifer

i came across a book named liber falxifer. it is mainly about the god of death. looks like it's origins is mexico and argentina. feels like their god of death is similiar to lucifer. (as lucifer presents himself in different forms to different cultures.) this is the book:

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://archive.org/details/liber-falxifer-the-book-of-the-left-handed-reaper&ved=2ahUKEwjk6dvSm-WMAxXjB9sEHaC_D8cQFnoECCAQAQ&usg=AOvVaw0n2w8BRd7p_jrrmOz8tKSPExternal ↗

it made me curious. anyone know about this?