I just got out of a Nidhogg normal clear on my alt with a group of mostly fresh players, and the first pull was a complete mess. No one was stacking for the stack marker. I told people to stack on the waymark for the Akh Morn, placed a waymark, and then someone removed it.

This continued for the entire pull. Every time I placed the waymark, it would be removed almost immediately. I told people to stop removing it, but it continued.

Obviously someone thought they were being cute or trolling on purpose to try to disrupt the run. I tried watching the party to see if anyone was messing up mechanics when it was being removed to figure out who it was, but so many people were already being hit by stuff at random that I couldn't tell.

Afterwards, when we killed it and I commented on it being disruptive and that I don't know who was doing it, someone said "the idiot placing it probably", trying to take a jab at me for putting a mark down.

This is harassment, to be trying to organize mechanics for new players, and then having one person griefing and intentionally disrupting it. However, there is no way to tell who was doing it to file a report on it, because there are no chat messages or indicators for it.

So, I suggest to simply add a log message indicating who is placing or removing marks, just like with the overheard markers. When someone puts a mark on you, a chat message appears saying "Person marks you Target to Attack 1", etc. A simple chat message of similar effect, "Person places/removes waymarker A" would be useful for these kinds of situations.