The name ‘Enigma’ in the Omegaverse is usually portrayed as a rare, mysterious or unique secondary gender — they don’t follow the rules of the standard hierarchy. Some fics treat them like a secret or suppressed gender in society. Others frame them as powerful or unstable because they disrupt the usual Alpha/Omega roles. It really depends on the story, but the main idea is that they don’t fit into the usual Alpha/Beta/Omega categories. That’s why they’re called ‘Enigmas’ — because they’re hard to define.
Being an Enigma means the person shows biological or behavioral traits of both Alphas and Omegas — like having a strong, dominant presence, but also going into heat or being able to conceive , they might experience heats and have a dominant presence,. Sometimes, they don’t react to or give off pheromones in the typical way, which makes them unpredictable or even dangerous in certain dynamics.

thinking about 2nd awakening that's mean that he is enigma - powerful and rare also they can make alpha pregnant