Hey, wait a minute

?

That ghost isn't Terraria.

It's a crossover summon

Really? They added more than just the Deerclops?

Way more

They have Monster Meat, Abigail's Flower, Tentacle Spike, Ham Bat, Bat Bat, Firestarter and Gentleman vanity, Weather Pane, Radio Thing, Pew Pew Matic, Eye Bone/Chester, Tartar Sauce/Minotaur, theconstant special seed, Don't Starve exclusive cloud forms, Houndius Shootius, and a lot more

It's been in the game for years

It has?

Since 1.4.4