[Cerek the Barbaric]

It's called the Cloak of Cheese because it is considered to be far too powerful by many of the veteran gamers. Any spells that specifically target the wearer of the Cloak are automatically "reflected" back at the caster.

It is possible {for example} to kill every beholder in the Underdark without ever attacking them at all. Just put on the Cloak of Mirroring and walk right up to them. Their attacks will reflect back on them and usually kill them in very short order.