"Now that you've brought me some Isotopes, I'll begin analyzing them immediately. In the meantime, I've also detected some Enriched Uranium in the area. My scans indicate there are Nuclear Blazes out by Ring 19. Find them and bring me 20 x Enriched Uranium, so I have even more material to analyze."
With wings and rocket boots, fly to the purple and white rings outside Nichol's house and count them until you get to Ring 19. Locate the spawner surrounded by Blazes, located in the fortress. Collect the Enriched Uranium, dropped as Blaze rods, and return to /warp chapter3 after you have collected 20.