Talk to this Guard. Also make sure to grab the knowledge from the Explorer in front of him. They are at the entrance of Bree Tree Ruins Cave.
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Anonymous 2-04-2017 01:15
Since the location isn't mentioned anywhere, they're located west of the Bree Tree Ruins.
The Knight has the knowledge for Bree Tree Forest Cave and the Explorer has the knowledge for Shards of Ancient Architecture.
- Map Location - Area Location - (same image as GrimElite).