Essential Material: Kent Lens (Patreon)

 Kent Lens [Term] 

An ordinary set of glasses, or so they would appear. A specialized thaumturgical device designed to be worn and wielded like common eyewear. When worn, the wearer appears "exactly as they are."  

Designed to obscure details intended to remain secret, these glasses actualize a special kind of thaumaturgy similar in nature to a curse that prevents the attachment of certain abstractions to the one wearing them. In doing so, they prevent onlookers from making connections between the wearer and specific ideas.  

When worn, others will be unable to connect such things as "secret identities" or "alter egos" to the wearer, protecting their true name and, in the case of Servants, class.   

However, this protection is too fragile to continue functioning if "irrefutable evidence" is made obvious. The utilization of unique abilities or the deployment of a signature armament or Noble Phantasm will negate the effects of these glasses completely.  Furthermore, facts deduced from less obvious evidence or conclusions reached through logical reasoning are also too strongly supported to be denied.

Incidentally, the origin of these glasses is obviously the disguise of Clark Kent. In spite of the very clear connection between Clark Kent and Superman, the identity of Clark Kent remained secure by nothing more than a pair of ordinary glasses.