Argus

All information taken from Blizzplanet , Wowhead , Icy Veins

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Comprehensive Argus guide – includes unlock schedule , zone buffs , professions etc
Official patch notes-
Zone Buffs
Garothi Obliterator , the Felnado (not it’s real name) and the Paraxis
The Augari Treasure Chests
Imp Meat
Panthara Pets for Hunters
Grimoire of Lost Knowledge
Call of the Devourer
Invasion Points guide
Comprehensive Argus guide – includes unlock schedule , zone buffs , professions etc
Zone Buffs
1a
1b
Garothi Obliterator , the Felnado (not it’s real name) and the Paraxis
The Augari Treasure Chests
Imp Meat
You need 100 to make a Disgusting Feast. You can then put Disgusting Feast in front of Mother Rosula’s pool in the cave whose entrance is at 65, 26 in Antoran Wastes. The empty pool with dead fish bones. It summons her to the surface to make her attackable. She has a chance to drop the item Rebellious Imp which teaches the battle pet Rebellious Imp.
Panthara Pets for Hunters
Petopia and the Secret Finding Discord have discovered how to tame Panthara Pets as a hunter! http://www.wowhead.com/news=271022/taming-panthara-pets-discovered-by-petopia-and-secret-finding-discord
Grimoire of Lost Knowledge bought with Nethershards – from Warmage Kath’leen at Deliverance Point – Broken Shore Grants 6000 xp directly to a champion
Call of the Devourer
Players must first obtain Call of the Devourer scroll, and then collect 3 different items to create a Bone Effigy.
Imp Bone – (65.89 19.42) Located in the Den of Fiends (same cavern system as Mother Rosula) in northeastern Antoran Wastes. The bone can be found on the ground in front of the second imp mother’s pool of fel.
Ur’zul Bone – (50.39 56.15) Located next to an alter and a large bone spine protruding from the ground at Collector’s Hovel, northwest of the Felfire Armory.
Fiend Bone – (52.37 35.33) Located behind a small pool of fel at Scavengerss Boneyard, south of The Spirit Crucible.
Once you’ve collected all 4 items, head southeast of Scavenger’s Boneyard where you’ll find a marked green spot on a pile of bones.The “marked green spot on a pile of bones” is at 54.8 39.1
Call of the Devourer scroll from mobs across Scavenger’s Boneyard (around 55, 39 in Antoran wastes) to able to see the bones. Interact with this pile of bones and create the item that will summon the rare elite.
Uuna is not a 100% guaranteed drop from The Many Faced Devourer.
Uuna is a non-combat companion and cannot participate in Pet Battles.
-From WarcraftPets