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After every happily ever after, comes the very next day. And the day after that. And the rest of ones life. With Vor defeated, Sofia goes on to be a real protector. The kingdom is safe, the aisles are at peace, the world is safe, and it's all thanks to Sofia. The strong, brave, selfless hero...who is also just a 10 year old girl, carrying immense weight on her shoulders.
(massive spoilers. takes place right after the series finale)