This is the third series of DERPs and things are a little darker now.
The who idea with this series was to blend into weirder and weirdly bizzarre creatively creepy derpy type creatures.
The packs have been re-issued and are now available for minting here: https://nfthive.io/drop/nfthivedrops/4544
You can open these packs at NeftyBlocks and be sure to also check out all the blends.
You can see which blends are available by scrolling down too.