Understanding the Term 'Enigma' in Context

In the quiet town of Elderspring, nestled between lush hills, rumors circulated about a mysterious figure who appeared only at twilight.

Locals described this figure as an enigma, a person cloaked in shadows, rumored to possess knowledge beyond the ordinary. Children dared each other to approach the figure, their hearts racing in a blend of fear and curiosity. However, the adults admonished the children to stay away, warning them that the figure could be more than just an eccentric hermit.

What does the word enigma most likely mean in this context?