The Riffel Rule is the effect of a key made by Hans Riffel. It is what disables an adult's ability to directly see magic, specifically the effects of the keys.[1] It takes effect upon entering Keyhouse through the main door on the west side of the building.[2]


The rule came into effect sometime after 1942, possibly after Hans Riffel used the Hercules Key to seriously injure or kill some men during World War II.[2] Until Tyler Locke, Riffel was the final person to use the Whispering Iron to make a key.[1]

The purpose of the rule was to prevent adults from discovering, using, or abusing the powers of the Keys.[1]


The Riffel Rule only seems to apply to adults in a clear state of mind.