"Ezreal was born with the gift of magic flowing through his veins. Ezreal, however, was also born with a much stronger sense of wanderlust. Put into school to become a skilled techmaturgist, Ezreal quickly became bored with magical studies. By the time the boy genius was eight years old, he had fully mapped out the underground tunnels of Piltover."
from the ezreal lore. it was a simple answer for you to find on your own and is hardly off-topic, so yeah, we didn't take it seriously. lighten up, man.