As seen in the Solo Leveling manhwa, Go Gunhee was a vessel of a Ruler. But again, old age prevents him from tapping into that power to the fullest and/or fighting for extended periods.
It’s tough to be a hunter in Solo Leveling, but it's tougher to be a hunter like Go Gun-Hee, who can’t do much but watch the next generation fight on the battlefield. If only his body hadn’t ...