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As Drake swam to protect Aquarius and fight the two Sea Kings with his two beloved wives, he left behind everyone else to protect the mermen, which was his top priority. For him, it would be much harder to protect and secure these people than to just fight two huge monsters with the help of an already grown up Aquarius, who was already vastly stronger.
And as they went their separate ways, Benladra, Kate, Rose, and everyone else quickly started fighting the swarm of hundreds of giant sea monsters that were attacking the city, cleaning it from monsters while also calming the mermen, using Sapphire as their medium.
"Please, everyone calm down!" She said, using Ancient Mermen Tongue to quickly convince the people she was not some random outsider.
"A Mermaid?!"
"Y-You! Did you brought these freaks with you?"
"Well, they're helping us survive, don't call them freaks!"