Secret hybrids created with specific species as parents, always including at least one first-tier hybrid species.
Special hybrids can be bred through (usually) several possible combinations of four base species genes of (usually) three types for example Naiad is made (or at least used to be made, not a 100% sure nowadays) as a combination of 1 or 2 plant genes, 1 or 2 mermaid genes, and exactly one Lymean gene. Despite how they are made only two genes are "owned" by the resulting specimen and it's those genes that will be used in further breeding and rituals. For the sake of skillpoints (but not body parts) Rituals for Special hybrids are the same as rituals for normal hybrids with the same owned genes. So for example ritual with a Mermaid+Lymean Angler is, skillpoints wise, the same as a ritual with a Siren. So, continuing the example, if a first ritual was with a MaxLevel 5 Siren and the second with MaxLevel 7 Angler, the first would give you 5 sp, and the second 2 more sp, after which the list on the "c" page will show you that you've "ritualed" with a MaxLevel 7 Siren.