From the first map in Palborough Mines, take the elevator at I-8 up to the Third Floor. Ni'Ghu Nestfender spawns from a ??? located in G-10. Nothing here will be high enough to aggro you, and the room is usually empty, but if some Quadav have wandered in, of course, clear the area beforehand.
When you get to Castle Oztroja you need to go past the first doorway with the trapdoor and proceed up to the 4 lever door at the SW corner of G-8. You can find the combination to the door at the dead-end at (I-10).
Once inside this doorway proceed all the way up the stairs to a chamber with a pool in the middle of it. This pool will be surrounded by Tier 6 Yagudo and full of Yagudo Parasites.
The leeches aggro by sound and the Yagudo aggro by sight.
Deidogg wants to prove that the Talekeeper Raogrimm was no hero. First, he wants you to defeat the Quadav nest guardian in the Palborough Mines that Raogrimm claimed to have killed, and take from it the mottled Quadav egg the Talekeeper failed to bring back.