The Sinister Stack is a legendary pet in Egg Simulator.

Methods of Obtaining

• Purchasing the Mystery Pet Egg and Assortment Pet Egg.
• From the Daily Reward.
• Inputting the code 666 during the [[Halloween 2020 Event].

Trivia

• Introduced at the at the beginning of the 2020 Halloween Event, the Sinister stack was removed at the end of it. It was reintroduced in the Mystery and Sinister Pet Eggs during the 2021 Summer Event.