So I found one of these in Dazar'alor around 57, 30. Can't seem to find a purpose for it yet, but when clicked, it brings up a team consisting of Mr. Terrible, Carroteye, and Sloppus, which I took down. Didn't receive anything.
Beast
Challenge Post
Click to start a pet battle.
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The best place to find strategies for the Challenge Post pet battles are under the names of the pets you are battling. For example, Brutus and Rukus strategies are found via these links.
This specific Challenge Post is for the Garrison pet battle against the bird trio of [npc=85674], [npc=85675], and [npc=85676].
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
Hunter Pet: Spider
Challenge Post belongs to the Spider creature family, which Hunters can tame; its pet specialization is Ferocity. The Spider diet in the client data: Meat. The Spider family’s own pet skill line (Pet - Spider) teaches 2 abilities:
More Spider
Other creatures in the Spider family. See the whole family.
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Level and Map Tracking
The game data tunes Challenge Post for levels 10 to 40, Warlords of Draenor content.