With addon Metamorfo mobs will be able to transform in hostile mobs. They will do this random and automatically. It makes mobs stronger and your survival harder. I think it is great idea to make this addon and it mobs transformation will make your game more interesting.
How does it function?
This addon let transform mobs in your world. For example you will meet zombie and fight with him. In some time zombie will transform in skeleton, then he can transform in creeper. It will be so hard to kill him.
screenshots from this addon you can find below
download Metamorfo Add-on for Minecraft PE 1.14
[last version] Minecraft PE 18.104.22.168 download