In Minecraft coding, does the Blood Warden actually exist?

Answer 1

As of my knowledge cutoff date of September 2021, there is no item or entity known as the Blood Warden in Minecraft. It is possible that it is a custom mod or feature in a specific Minecraft server or modpack, but it is not part of the official Minecraft game. If it was added after this date, it would need to be verified with up-to-date resources.