
In the War Campaign prior to Lingering Shadows, a battle erupts in the area these are found in. Afterwards, the native wildlife in the area is replaced with scavenging nerubian worms, with untargetable doodads of dead wildlife in the area.
Issue comes that this pet only exists in that area. I tried to look with another character on my account, quest syncing with a trial account, and sending a friend to look (said friend had not completed the war campaign and had only gotten to Ringing Deeps before just dungeon spamming to level cap), and all of these turned up with nothing but the corpse doodads.
There's still the void warp stalker with a blue aura that looks nearly identical save for differing coloration, but the warp stalker with a specifically purple aura appears to be currently unobtainable until further notice.

If you're available to check, it'd help if you could go look in the area bordering Hallowfall and Azj-Kahet and report back if you're able to find anything to contradict what I'm saying here.