I was looking at the assets.xml files and noticed that there's a wrong GUID for Epic rewards for shepherd Quests.
The current GUID Points to nothing, so there isn't any Epic Rewards from Shepherds.

Here's the detail :

Spoiler:  Show

PHP Code:
<Asset>
<
Values>
    <
Standard>
        <
GUID>130369</GUID>
        <
Name>Archetype (ShepherdResident Quest Reward Pool</Name>
        <
Version>dlc06</Version>
    </
Standard>
    <
RewardPool>
        <
ItemsPool>
            <
Item>
                <!--[
RewardItemPoolArchetype (ShepherdCommon Reward Pool -->
                <
ItemLink>129969</ItemLink>
                <
Weight>20</Weight>
            </
Item>
            <
Item>
                <!--[
RewardItemPoolArchetype (ShepherdUncommon Reward Pool -->
                <
ItemLink>129987</ItemLink>
                <
Weight>30</Weight>
            </
Item>
            <
Item>
                <!--[
RewardItemPoolArchetype (ShepherdRare Reward Pool -->
                <
ItemLink>129988</ItemLink>
                <
Weight>25</Weight>
            </
Item>
            <
Item>
                <!--[]--> 
### THIS LINK IS BROKEN, should be 129989
                
<ItemLink>127487</ItemLink>
                <
Weight>10</Weight>
            </
Item>
            <
Item>
                <!--[
RewardItemPoolArchetype (ShepherdLegendary Reward Pool -->
                <
ItemLink>129990</ItemLink>
                <
Weight>5</Weight>
            </
Item>
        </
ItemsPool>
    </
RewardPool>
    <
Locked/>
</
Values>
</
Asset