Additions:
How to find/spawn the mobs:
How to get the items:
Secret:
To list all of the nearby new mobs type in the following command: /testfor @e[tag=Custom_Mob] you can also kill all of the nearby new mobs by typing in this command: /kill @e[tag=Custom_Mob]
Screenshot:
Command Block Showcase:
How to install:
Command:
For 1.9