Final Answer:
Sera had to use the ancient artifact known as the “Aetherial Blade” to destroy the Black Cloak.
Step-by-step explanation:
The Black Cloak was a powerful and malevolent entity that had consumed the kingdom of Eldrador and was threatening to spread its darkness to other realms. To defeat the Black Cloak, Sera needed a weapon of great power and purity. The Aetherial Blade, a long-lost artifact from the time of the gods, was the only weapon capable of destroying the Black Cloak.
The Aetherial Blade was forged from the purest metals and imbued with the power of the elements. It was said that the blade could cut through anything, including the very fabric of reality.
Sera found the Aetherial Blade in a hidden chamber deep within the Eldrid Mountains, where it had been kept safe for centuries by the ancient guardians of the realm. With the Aetherial Blade in hand, Sera was able to destroy the Black Cloak and restore light and hope to the kingdom of Eldrador.