Cloudy Quartz discovers a giant, beating, horrifying heart of stone underground. Equestria is alive, and it knows she's there. A cutesy story about marriage.
Foals are often more than a hoof full, particularly if your experience with them is limited. When you make a rash decision, deciding to take care of a filly with near unlimited power for example; it becomes even more complicated.
Chrysalis is beaten. Her invasion of Canterlot? Failed. Her hive? Scattered to the winds. The future of her people? Bleak, grim, and hopeless. But change is in the air, and something is calling Chrysalis north, to the birthplace of the changelings.
