https://forums.d2jsp.org/topic.php?t=109237921&f=169I Sell sets to fully unlock yourself.
Completing the full chain rewards you with:
A private Cow Island off the coast of Scosglen
The exclusive Moo emote
A dedicated achievement and title
The ability to invite others into the cow level by mooing at them
Personal portal access from the Cow Island basement on Tuesdays