After having killed 100s of these - Today was the first time I've seen "A Valorian Guard" who can see through invisibility. He was one of the two guards at the arch just a little way down the path from the 3 Wrulon spawn near the North Basement. I kited him and First Seargent Henrick Iverson, who added, around on the little elbow back down the path. I faded off Henrick Iverson and found nothing different on the corpse. Oh well, at least I may have saved a few people who take these mobs' non-see-invisibility for granted (Like I used to)
Serenae Whispersong 65 Bardess of Tunare on Xegony The Fellowship of the Griffon
Can be snared/rooted. Can be mezzed. They may be able to be stunned(with an appropriate level stun) but am unsure. Slowable. Charmable. They don't summon.
They are used as PH's for nameds(but not all of them are PH's) and there are some spots scattered around the zone where A Valorian Guard/A Valorian Guardian are PHs for each other(sentries have never spawned for me in these spots)
Never seen them drop parchments but have seen them drop most of the other loot listed above.
After about 150 kills, I got plenty of hero parts, some bricks, and 1 ethereal parchment. I am still hoping for spectrals, but from what I have been told, it takes a lot of patience.