His whereabouts shift on a daily cycle: per Caine, he leaves for the Old Mine every morning and only comes back to camp at night, so you must catch him in the right place at the right time.
Old Mine (during the day) / Swamp Camp (at night): Templar who collects minecrawler ichor for the ritual; he goes to the Old Mine every morning and returns at night, so where you can reach him depends on the time of day
Gor Na Drak can be found in the Swamp Camp (Templar).
You: Hey. Where are you off to?
Gor Na Drak: Us? We're bringin' the crawler ichor we got at the mine back to Cor Kalom.
Gor Na Drak: It's what we do every day. We need it for the dreamjuice.
You: How much more ichor do you need for the ritual?
Gor Na Drak: A lot. We hunt day and night.
You: "Crawler ichor?"
Gor Na Drak: Yes. The minecrawlers ooze it from their mandibles. If you extract the mandibles properly, you can gather it for your purposes.
You: What does Cor Kalom need the ichor for?
Gor Na Drak: Like I said - the dreamjuice. We need it for the Great Awakening.
Gor Na Drak: It steels our minds so we can withstand the Sleeper's power during the ritual.
Gor Na Drak: But there's still so much to gather ...