Mask of the Red Death is a secret character in Vampire Survivors that players can unlock by defeating the Reaper that appears at the end of a run. While this may seem like a monumental undertaking, it is indeed possible to beat this boss, provided that a player employs a very specific strategy. This guide will detail a strategy that can be used to kill the Reaper in Vampire Survivors, and fans that follow along should eventually unlock the Mask of the Red Death.