In Minecraft Java Edition, there is a small chance that certain hostile mobs can spawn with armor parts or any item in their hands.

Minecraft players can add new mobs to their world through spawn eggs or console commands, and specific commands can even remove the artificial intelligence of these mobs.

In Bedrock, you can summon it directly by typing slash summon Warden, while on Java, the command to summon it is Minecraft colon Warden.