The Morbid Harvester is a boss mob from the original mod, Mob Fusion mod. This add-on "ports" this specific creature to Bedrock. The original mod can be founded here :
https://www.planetminecraft.com/mod/mob-fusion/
Original mod by FiskFille
Select version for changelog:
Changelog
- Revamped the Morbid Harvester
- Removed the 3D Morbid Harvester's Arm model
- New attacks
- Fixed Morbid Harvester's death problem (hopefully ;-;)