Comentários

You have to find four books over the world:

Os Mistérios dos Deuses Selvagens can be found in Suramar, Moon guard Stronghold, coordinates 34.7 22.5, there's a inner yard where you'll see a kind of "library", book is next to a big shelf.
As Lendas Desconhecidas da Guerra dos Antigos can be purchased from Rosa Ranzinza npc, she's in Booty Bay standing on a pier, coordinates are 41.3 68.6. The book costs 200 gold. Rosa also sells many books for other classes.
O Falso Guardião located in Castelo Corvo Negro instance. As you killed Amálgama de Almas (the first boss) and passed through the door that spirits open, you come into circle room,the book is on the table next to a wall, table is left from entrance. I did this part solo in normal BRH, 885 ilvl hunter, but seems you may solo that with 870+ ilvl.
A Expedição da Aliança a Draenor is in Salões Escarlates instance, in Tecechamas Koegler room, on s table.

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A Expedição da Aliança a Draenor

Nível do Item: 45
Item de missão
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Requer Nível 45
"A história da pequena expedição de heróis da Aliança que se aventuraram pelo Portal Negro, muitos dos quais jamais retornaram."