Greatsword bug:
The summon Illusionary Berserker is able to be cast through line of sight. I haven’t tested on my own Mesmer but I was in WvW on a wall defending by myself against a group. I was well out of line of sight at the rear of the wall but I had Berserkers summoned to attack me multiple times. My enemy was below and could not see me, and I did not move forward to place myself in their line of sight.