They are homebrew sins made by other players and homebrewers, you can find a link to their page on the document or on this page
Edit: For your ease here's the links for the Heron: https://docs.google.com/document/d/1GZMr_1cskQ99b43kBk3NFCNQvVjoEm69Ao183iaPNpI/...
and for the Pyre: https://docs.google.com/document/d/1PPRWTO6jamMTIHuZQi2lI_t_mpzZzVvVQNHt_bXGdLE/...