There seems to be some speculation as to where the quest comes from, but I pulled something up.
From what I have gathered it starts by finding one of the two pieces of the amulet. Once you find one the marker will appear to lead you too the other half. It it appears to be titled "The Aster Inheritance"
The quest outline and locations can be found here.
Location of the grave for those who want it:
"Bodan Aster's Grave is located South of Dolve Wayle in the Tala-Rane section of the Plains of Erathell. The grave is particularly difficult to spot due to the fact that it's nestled in a corner on the north side of an old caste wall. There is a bright Edelweiss plant in the same area as the grave which may be easier to spot first. Additionally there is a Tala-Rane Lore stone nearby too." - From the Wiki