Hello guys! Actually it's pretty bad that people use exploit on our server, making the game experience bad for us all, so I hope the GM get some action about it. However, the few times I went to watch cursed weapon by night, I also saw the people you're talking about using another bugged strategy: they keep wynn elemental masters outside of the pvp zone and send the unicorn inside, hitting the chest with the stun and knowback skill ( that has a high proc rate as you know ) but, since the summoners are outside, the unicorns don't deliver damage to the chest! So they're actually protecting the chest by attacking it, and the HP of the chest dont go down so they can freely spam that skill without risk of breaking the box. I hope, like you, that these people get some consequence for this kind of behaviour!
Thank you and sorry if I did some error ( english is not my first language)