Hello 
I’m sorry for what you described, however if I were you i wouldn’t post players names / IDs on a public thread, because the moderation might erase your topic.
If you have proofs of griefing there is a procedure here for reporting bad players / behaviors.
And indeed your question about thoses 3-skulls siege bosses remains valid… and I’m curious of the answer Funcom could provide, event if I’m afraid this will end like for the purges.