Unfinishable: bug or exploit
I had the same problem yesterday. I’m in Aurora ,tried to kill a Guardian from Abbadon’s Mouth, and i couldn’t finish him. 10 times, changed angle, i put stability, i put every boon i have and it was imposibble. When i tried to hit him with auto attack i got an invulnerable msg. I hope for a quick fix.
Happened to me in sPvP once, this definitely needs to be fixed. There should also be a Report option for “Exploiting/Cheating”.
Apparently this is not a singular occurence, and if it happens in WvWvW as in sPvP it sounds all the more like a cheat or exploit that should be rewarded with a nice lengthy ban.
There’s whispers and rumors that there’s this Godmode hack that’s been released to players. I’ve searched for videos of it after I also encountered one of these “invulnerable” players, and it turns out it’s true. There’s a hack out that manipulates the game by injection and gives the player infinite Protection that doesn’t appear as a Boon. I’m sure it can be patched, but I don’t know if ANet is willing to implement a hackshield.