Even though the Ethernere guards will attack Good-aligned players on sight, it is still possible to receive this quest by right-clicking and hailing the guard outside of their aggro radius.
Steps[]
Kill graverobbers until you receive four relics.
Graverobbers only spawn during game night, between 8pm and 5am.
Graverobber spawn points must be empty of other mobs (skeletons and zombies); kill the placeholders just before 8pm game time so the next spawn will be a graverobber:
( -85, -11, 28 ) Copy/waypoint -85, -11, 28
( -75, -15, 19 ) Copy/waypoint -75, -15, 19
( -61, -11, -32 ) Copy/waypoint -61, -11, -32
( 47, -3, -30 ) Copy/waypoint 47, -3, -30 - outside the blue quest area on the map but spawns graverobbers that update the quest.