In the GMM mission The Darkness Howls, Grash, Bloodmoon Growler spawned but was not on track with a level 110 ranger with 300 track and was standing right next to the mob.
Yeah, it's pretty dumb that you can't track him. However, you can pretty quickly get a fix on whether he's up, because there are 3 PH 'Bloodmoon Scrabblers(??)' that spawn. If you see all three, then he didn't pop. If only 2, you can check the 3 spawn points to find him. They don't roam. . .
Or, you know, when it pops the big message that tells you a "formidable foe" has arrived and you should go challenge it.
ugg.. I just thought the message had to have been bugged. Ran all over the zone when it didn't show on track and never ran into him.
Key is he is a none gnome related mob.. Means he is not on the mountain or in the mountain. He is only in the area that is all the other mobs..