I retired Sergio, after he sustained a motor nerve injury to his left hand.
Aftewards, I had fun making a swordsman character, and just slaughtering entire towns to train up his sword skill. Retired him too, cause I wanted to find where Sergio was so they could meet ( and potentially fight ).
After a bunch of rigmarole with Sergio and him always moving to a different hamlet than the one I retired him in ( due to him owning sites ) I decided to turn Sergio into a werebeast, so he could heal the damage to his arm.
After almost a dozen savescums, I finally turned him into a wereloris. Then came the tedious process of sleeping the days away, eating and drinking, just to wait for the transformation.
It was honestly hilarious how weak the wereloris was, stat wise, compared to how Sergio was normally. But another day of waiting, and Sergio returned, completely free of injury, scars and blemishes. The King of Muscle was back.
I retired him in a hamlet called Judgetwinkles, making sure he'd actually stay there by claiming the position of lord before retiring. My swordsman, named Kore, travelled there and finally met him.
I tried to see how fighting Sergio would go, and it didn't end well. Even with both hands stabbed through, Sergio beat the brakes off of Kore and killed me.
One savescum later, I've decided to try and earn enough renown as Kore to work for Sergio as a Hearthperson. Maybe assemble a nice little superhero squad of legendary adventurers, and make them all Sergio's hearthpersons, in time.