Graphic-wise, they're completely normal elite monsters with a pack of minions, the only difference is the Herald itself has a purple effect floating above their head. And as far as I've seen they always have an aura (Concentration, Thorns, Vigor...!)
[EDIT] oh I've got a screenshot here of the first one I encountered:
Yes, three in a row during separate TZ Baal runs. All were in the Throne of Destruction. They were just regular level monsters with swirling purple halos above them.
I saw one just by chance in the recent Cow Tz. In other TZs I'd received the message the Herald Is hunting you (Frozen Tundra). I looked and cleaned the entire lvl but I saw no Herald, the same happened in the triple Kurast TZ, for Lower Kurast. Again I cleaned everything and again I saw nothing, and I decided the problem was probably me. So when the "you're being hunted" message popped up during cows, I took my time and went carefully. Moments later I noticed that one of the harder to kill cows now nearly dead had the Herald label. It occurred to me that I was killing them too fast to identify them. So I'll try to not kill them too quickly and maybe I'll be able to get a screenshot.
I did take a screenshot of the message I got in the triple Kurast TZ.
I encountered another. I made a video of it, but as soon as I got the notification the game began dropping frames, and one the Herald made its appearance the frame rate was so slow that the ending is painful to watch. I did however find a decent frame for a screenshot but with the map showing as well. This time the Herald appeared as one of the carrion birds.
You draw the ire of a herald doesn't always mean you will encounter one.
Exactly. That's just a first announcement, the Herald does not spawn just yet.
If you keep playing TZ and killing elite/champion monster, eventually there is a second in-game message which says "A Herald is chasing/hunting you in *AREA_NAME*" -- that's when he actually spawns.
You draw the ire of a herald doesn't always mean you will encounter one.
Exactly. That's just a first announcement, the Herald does not spawn just yet.
If you keep playing TZ and killing elite/champion monster, eventually there is a second in-game message which says "A Herald is chasing/hunting you in *AREA_NAME*" -- that's when he actually spawns.
It would be a more sinister element if the Herald did actually chase after you but they seem to be stationary fixed targets within their elite packs. So far none have been of any real difficulty, although I hear that scales with each passing encounter. I've yet to see any proof.
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