Izroth only found out about the shadahi by chance. After all, if he never chose the combat master class and met Gear, he never would have run into the shadahi. Or, at the very least, he would not have run into them as early as he did.
That being said, even coming into contact with the shadahi that early was no simple task. In order to reach that place, Izroth had rely on the Seer Tererestiaa, who guarded the seal on the Shadahi Realm and an S-ranked magic item called the Boundary Sealing Sphere.
Needless to say, the chances of another player making contact with the shadahi around that time with such harsh conditions in place was highly unlikely. Still, based on Haishe's words, that's what seemed to be exactly what happened.
