Make it so that Garen can't the make the Villain the person who's killed him.
The way that garen's Villian mechanic works makes it so that his lane opponent is punished for killing garen, because if he does it enough or if its a low scoring game early, garen gets a free comeback. Its stupid.
So make it so that even if Garen is 0/2 and the enemy laner is 2/0 garen doesnt get free bonus true damage for getting killed. It even fits thematically because Garen is supposed to be protecting others from those who do them harm not to himself.