The Dead Speak (Find The Flat Tomb) is a request quest of Crystalline Forest in MIR4. Guide contains Flat Tomb Location, quest giver & unlock condition.
Table of Contents title
How To Unlock The Dead Speak Request

Requirements For The Dead Speak
Prerequisite | Guided by Destiny: 24. Go to Brother Sangbaek |
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The Dead Speak Request Quest Giver Location
Quest Giver Location

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The quest giver "Biyeong" is at the upper-right part of the Crystalline Forest.
The Dead Speak Request Guide & Flat Tomb Location
Map Location

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Close Up Image

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Go to Demon Bull Temple 1F and you will find the Flat Tomb at the southern part of the large circular area in the middle of the map.