Update: Added info on the Amalgamation of Flesh and Wicked Lurker drop. Thanks to
@WayneGWoods for the heads up!
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Notes for myself to keep track of which rares are important in Patch 8.3. See below for approximate locations of rare mobs that spawn during specific invasions and have a chance to drop a battle pet.
There are 3 separate invasions for each zone (only one up for each zone at a time). I'm not 100% sure that the listed invasion *must* be active for these rares to spawn, but it would only make sense.
Vale of Eternal Blossoms, during a
Black Empire invasion
1 = The Forgotten (drops K'uddly)
2 = Will of N'Zoth (drops Corrupted Tentacle)
Amalgamation of Flesh - unknown location, spawns during Black Empire invasion (drops Wicked Lurker)
Uldum, during an
Aqir invasion
1 = Lord Aj'qirai (drops Rotbreath)
2 = Skikx'traz (drops Aqir Tunneler)
Not pictured:
Uldum, during a
Black Empire invasion
Amalgamation of Flesh - spawns during Black Empire Uldum invasion, requires the Pyre of the Amalgamated One bonus objective to be active for the rare to spawn (drops Wicked Lurker)