Hydreigon and Noivern share hunting grounds. Both favour dark oak forests after sunset and also turn up underground, so one trip can find both lines.
Surface Hunt: Dark Oak Forests at Night
1. Find a dark oak forest. Look for thick, wide-trunked trees with a dense canopy that blocks most sunlight.
2. Do not sleep. Both lines spawn here at night, and skipping the night skips your chance. Light torches around a small camp instead.
3. Walk the forest floor and the clearings once it gets dark. Hydreigon's line can appear here, and Noivern's line too.
4. Hydreigon's line also spawns in mountains at night. If a mountain is near the forest, check its slopes on the same night.
Underground Hunt: Dripstone and Deep Caves
- Hydreigon: Search dripstone caves, which are full of pointed dripstone hanging from the ceiling and rising from the floor. Watch your head for falling stalactites.
- Noivern: Look in deep caves. Head well below the surface and search the large open caverns.
Tips
- Bring plenty of torches. Vanilla hostile mobs spawn in the same dark places.
- Pack food and a bed for your return trip, but use the bed only after you are done hunting.