Bridge of Birds:
The High Canyon-Bridge, a narrow and precarious bottleneck on the road to the outer Wastes has been blocked by a Vulture Knight. The honourable, avian Paladin claims she must guard the bridge against all who trespass on its holy ground, offering single combat to those who would dare her crossing.
The bridge towers thousands of feet above the impassible, rocky floor of the abyss. It appears too angular to natural, but too weathered and petrified to be man-made. At some point there was a central pillar to either side, supporting the middle of the span, but one has eroded almost entirely away and the other is ... fuck it, here's a drawing:
A bird sacred to the Vulture People has built its nest at the peak of the pinnacle. The knight will not move until the creature has finished raising its chicks. She either needs to be defeated or convinced that the nest will be left unmolested or can be safely moved elsewhere.
Research/Lore: The sacred bird is exceedingly rare and known to be an omen of mighty events and drawn to places of great power.
Clues: Searching under the nest reveals a corroded hatch.
The pillar once housed a small installation. Inside can be found: Lore regarding the wider mystery of the Ancients. Clues regarding secrets/locks of the [Main Dungeon]. Trapped [Lesser Guardian Creature].