Stuck on 127/128 collection

[The 53rd President Ronald Reagan]

As the title suggests I am currently on 127/128 unlocks and I just cannot figure out what I'm missing. It's the unlock between Spinach and Tri-Bracelet so I'm assuming it's a weapon but I only have one more character to unlock and its Queen Sigma but I need to get 128 unlocks first anyone know?

[Matthew]

Candybox maybe. You need to get it in a game for it to be added to the collection.

Try endless mode, hurry, with wicked seasons arcana. That would give you a lot of luck and a lot of chests to eventually get it.