Karth is feared among his team mates, and travels to games in a steel cage, with a muzzle and shackles. This is because he is a cannibal with a taste for ogre flesh. His mind has gone and he has the instincts of a rabid attack dog. At the start of each game his cage is wheeled onto the pitch and he is released, facing the other team, preferably the biggest player or an opposing ogre.
At the end of the game he is subdued by a ring of snotlings with long spears and shepherded back his cage. If he doesn't gorge on the pitch, he is thrown some bones and is even more savage in the next match.

Karth suffered a broken back in his fourth game, vs Shauukuurzum Aaraarshkaal, in Karahn-Carach. A troll put him down and the gobbos stomped all over him.
After the match, a wandering goblin shaman named Kpikkek saw the team had no apothecary and was touting for business. Rangor told him that if he healed him, he could follow the team and be recruited when they had enough cash. So the shaman pulled out his magic Spongeonnastick and rubbed it on Karth, who was healed. He didn't say thank you.