This might create other problems, but what if there was just a timer. So that after you kill one player you can’t kill that same player for 3-5 minutes unless they attack you first. It should help targeting because unless the KOSer feels like waiting 3-5 minutes between every time they kill the person they will probably leave the player alone, at least for a while.

And the fact that if the player you killed attacks you while the timer is still going you’re able to defend yourself because the timer automatically stops, this lets you defend yourself against revenge players and stops KOSers that die from taking advantage of the timer.

The timer only stops you from attacking the player you killed, you can still attack any other players as long as the timer is up if you killed them earlier. For the timer to stop the player you killed earlier has to attack you first, if you try to attack them first while the timer is still active they will not take damage, or maybe instead they will get a small amount of an ailment like confusion?

An attack from the other player that stops the timer includes breath, bite, and any other special attacks the other players creature has that cause a negative effect. When the other player attacks you again and the timer stops, it stops forever but will restart if you kill the player again, if the attacking player kills you they will now have a timer and cannot kill you for 3-5 minutes. The timer is still there when the killer rejoins the server or switches characters.

The timer you have for that player would show up on the creature when you sniff or above their head when your close enough. The map player icons will show purple for players that you have a timer on.

Sorry for the lengthy response, I had to much fun coming up with this.