When will Hess leave?

https://preview.redd.it/pgf8k0hn74gh1.png?width=853&format=png&auto=webp&s=fab70551b9be058fc22bd170995b1ed417876efb

Hello, sorry. Someone knows when Hess will leave the game? the patch says that will be available for a limited time but I cant find a exact date until we are available to craft a puppet.
Also if someone knows a better way to get the Enchanted Thread than farming the dungeons I will like to know x'DD I dont know if you have to do something on the dungeon for it to drop it or if I'm just unlucky.
In the end I think I'll end buying them x'D