The quest can only be started when Hawke is in Corypheus's Prison - Tower Base. The quest is both acquired and completed entirely in that level. The quest is started by finding the First Legionnaire's Journal in the Tower Base.
You must first find the three different Legionnaire's Journals in the Tower Base. They are in the following locations.
- The First Legionnaire's Journal is on a dead-end path to the south of the first main clearing.
- The Second Legionnaire's Journal is in a large submerged stone building to the north of the second main clearing.
- The Third Legionnaire's Journal is in a small cave just to the south of the next area after the clearing where Altar of Dumat is located.
Once you have found all three journals, a location marker will appear on your map showing where the body of Tethras Garen is located. This is in a small fortified area just before the main stone bridge across to the central tower holding the seal guardian. Hawke performs a Dwarven Rite For The Dead -- "Atrast tunsha. Totarnia amgetol tavash aeduc." -- and the quest completes. If Varric is in the party when Hawke performs the ritual, he will get emotional and urge the party to leave.