Enigmacy is a currently unstable neologism coined by Alex Kyrios (user:BDD) in January of 2005. A Google search netted eight individual results of this word being used before in a few blogs and forums.

Etymology

Enigmacy is a noun derived from the base noun enigma. The base noun comes from the Latina ænigma, meaning "riddle" and hence, the two words share a common origin.

Noun

The state or quality of being an enigma or enigmatic

• Shadow's enigmacy makes him a mysteriously appealing character.
• The enigmacy of D.H. Lawrence is worth analysis from any student.

Examples

All but two of the aforementioned previous Internet usages were not in any definitive context and were used in titles or names. These comprehensive examples follow.

• Not many even known that it's him when they see him. But his reputation for his enigmacy and his ability to kill easily is known all over. (credit: Gia Scalise, Elfwood)
• The recipe below was said to be the favourite of the Marquis de Sade, though who said it, and what grounds they had for saying it, remain shrouded in enigmacy. (credit: Alan Green, PracticalPointers.com)