Sometimes random books/notes, other than The Aetherium Wars, have a script attached (see below) to start DLC1LD_Misc. When read the "Investigate the ruins of Arkngthamz" entry is added to the quest journal. In my latest game this happened when reading the note named "Notice" (0008ACCC). The odd thing is that I read the note towards the start of my game (at level 10 or so) and it didn't trigger the quest, then read it again later (at level 47) and it did trigger the quest.  SV console output