How does one complete this hero challenge? Maybe I'm dumb, but I've scoured the wikis and forums and internet in general for literally days and can't find a clue as to how to get the poison bubble that surrounds the underwater commune point to subside. Even after I kill everything, I can't commune because I'm getting interrupted by the area's auto-poison semi-sphere / bubble. It's the only thing I have left on the map, and I can't do it no matter what I try. It also amazes me that this hasn't been raised by any other player over the years Guild Wars has been active. The fact that it looks like I'm the only one who ever inquired reinforces to me that I must be dumb. I read that the statue of meladru in Graven Cay requires the Pact to control the Cathedral of Verdance as well as the Cathedral of Silence to make its poison sphere subside, but that's on a different map and doesn't help with the one I am stuck on.