170,000-Year Magicicada Nymph (17万年ゼミ幼虫, 17 Man-nen Zemi Yōchū) was a large Mysterious Being that attacked Z-City at some point during Saitama's training years.
The Magicicada Nymph is a massive cicada that has the face of a child located at the center of its head, between its eyes.
During Saitama's training years, the Magicicada Nymph attacks Z-City and defeats two C-Class heroes Grad School Graduate and Red Muffler and B-Class hero Darkness Blade with ease while the rest of the population barricades itself within Shelter Nr. 7. Sometimes later two unnamed A-Class heroes try to fight it, but are also defeated, this causes the Hero Association to declare it as a Demon level threat and they decide to send one of their newly built subjugation squads to finish it off. Saitama, while running around in search of a bathroom, runs into the Nymph who suddenly attacks him, but falls victim to Saitama's punch. Years later when Saitama has already gone bald, he encounters 170,000-Year Magicicada Adult on top of a building, and presumingly dispatches it with the same amount of ease as its Nymph counterpart.
Powers and Stats
Tier: 8-B | At least 8-B
Name: 170,000 Year Magicicada Nymph
Origin: One-Punch Man
Age: 170,000 years
Classification: Monster, Demon Level Threat
Lifting Strength: Unknown
Striking Strength: City Block Class | At least City Block Class
Durability: City Block level | At least City Block level
Range: Several meters by sheer size
Standard Equipment: None
Intelligence: At least Below Average
Keys: Nymph | Adult