Simplekey -

A customer walked in, a wealthy merchant holding a cumbersome, seven-pound iron key. "Good morning," the merchant huffed, setting the heavy key down with a thud. "I need a lock that can’t be picked. Something with twelve levers. Something impossible."

Silas looked at the merchant, then at the SimpleKey. He remembered Elara’s words: Difficulty is a cage. simplekey

It rejected modification.