Story
You found a Daeva named Pordhet hiding in the Abandoned Campsite attacked by the Blades. Clear the area and speak with him further.
After completion (spoilers)
"A river of death now flows through Gribade Canyon." You found Pordhet, a Daeva hiding in an Abandoned Campsite after being attacked by the Blades. He was a Recluse Daeva who had long lived in the area around Idun's Lake. After eliminating nearby Blades, you spoke further with Pordhet. He told you that the Blades had released a deadly poison into the lake, and that you would need some of the Blades' Protection Serum to enter the poisoned waters safely.