Bloody Monastery

• Charred Cultist’s Documents

Stats: Worker DEX +1

• Demons in the Dark

Stats: Worker DEX +1

Naga Extraction Mill

• Black Crystals Grade

Stats: Worker STR +1

• Extraction Mill Blueprints

Stats: Worker DEX +1

Northwestern Gate

• Black Crystal Purity

Stats: Worker STR +1

Southern Guard Camp

• Savage Migration

Stats: Fishing EXP Gain +1

• Surviving Monster Attack

Stats: Fishing EXP Gain +1

Southwestern Gate

• A Chef’s Composure

Stats: Worker VIT +1

Glish

• Black Crystal Pouch

Stats: Worker DEX +1

• Extraction Mill Laborers

Stats: Worker DEX +1

• The Great Fogan Migration

Stats: Worker STR +1

• Water Purification Facility

Stats: Worker VIT +1

Old Glish Ruins

• Torn Alchemy Journal

Stats: Worker DEX +1

Altar of Mages

• Dragon Watcher

Stats: Worker DEX +1

Those are all BDM Knowledge locations in Serendia that you can find. Hope this guide is helpful. If you want to find knowledges in other areas you can visit here (All BDM Knowledge Locations)