The players come in the dungeon, Do not kill anyone goes straight to the boss to kill and end the dungeon trolling the party of others, this should be punished.
I would like you to look at this image
The player in question called (EvilSquad) Entered two dungeons of LVL 140, To just kill the boss and nothing else disrupting the other players to play. Laughing a lot on our face because he was trolling.
I think players like that should receive punishment.