You picked one mastery that did get added to a lot of other maps in the world. The dragon fight in IBS, the new fractal, convergences, even in the new map Inner Nayos...
https://ibb.co/kMXmsCT
They work properly for me. And you are right, you need to destroy tents etc. during an assault. Are you sure they are completely destroyed? They are able to take quite some damage. I use the EMP to destroy them fast.
It's 'Grenth, I call upon your power', and 'I'm death incarnate'. I'm not sure where to find a full list, sadly. Edit: found this on the wiki: https://wiki.guildwars2.com/wiki/User:Relyk/sandbox/characterquote