Mechdusa

Mechdusa is a secret boss that can only be fought in the special  Everything  seed. It is summoned by using an Ocram's razor in an  Everything  world. It can also spawn naturally at 7:30pm, with the message "What a horrible night to have a curse." It is essentially a mashup of all 3 of the mechanical bosses that drop treasure bags even if the player is on classic mode or journey mode and almost resembles a much larger version of medusa. The 3 bosses act as separate entities that drop their respective drops and display the chat message '' (Mechanical boss) has been defeated! '' once defeated. However, when spawned the boss is a combination of the three mechanical rather than all three simply spawning independent of each other. Upon killing the last boss, the Waffle's Iron is dropped, a projectile-based melee weapon that fires waffle projectiles similar to the Meowmere.

Trivia
The three Mechanical Bosses can not be fought normally in the Zenith Seed (an alternate name for the "everything" world). Mechdusa is therefore required to progress further in the game.

The spawn message "What a horrible night to have a curse", is a reference to The Black Dahlia Murder's album of the same name.