The Cultist Robe is a Halloween item which can be obtained by sacrificing an item worth 90 or more Rarity to Growganoth. The Cultist Robe is just one half of the entire set; the other half is the Cultist Hood.
In-Game Description:
Rarity: 90
This item can't be spliced.
This item never drops any seeds.
Trivia
Punching while wearing this robe looks weird, as the hand sticks out while the sleeve doesn't.
Doing actions that use hand movement, such as /fp, /idk, etc., look odd, as your arms don't move while wearing the Robe.
The Cultist Robe also removes your arms while you are infected, looking pretty weird.File:CultistRobe.pngCultist Robe