荒野神靈之謎 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.
先祖之戰秘辛 can be purchased from 憤怒羅莎 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.
虛假守衛者 located in 玄鴉堡 instance. As you killed 眾魂融合體 (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.
聯盟德拉諾遠征記 is in 血色大廳 instance, in 織焰者喀格勒 room, on s table.

小知識

螢幕截圖

影片

虛假守衛者

物品等級：16
任務物品
唯一

需要等級 45
"歷史學家洛爾著作，研究洛肯背叛守護者同胞的事件。"

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