Year 517, A cataclysmic disaster floods most of the Earth's land, melting ice caps and leaving only 20% of the landmass above water. Humanity faces severe resource shortages and struggles for survival. Amid this chaos, a mysterious dungeon raid system emerges, offering a lifeline in the form of resources, food, clothes, medicine, and even new land through quests. Humans, now with genes fused with various aquatic creatures, have evolved into merfolk, each with unique tails resembling those of sharks, whales, and other sea creatures. The remnants of human civilization are scattered across a series of underwater and partially submerged cities, connected by the dungeon raid system. These dungeons appear as underwater caverns, ancient ruins, and sunken ships, teeming with both danger and reward.

The underwater city of Aqualis bustled with activity as merfolk swam through the streets, preparing for their daily tasks. At the Black Shark guild's headquarters, Bernat Valent reviewed the mission details with a focused expression, his pink eyes scanning the holographic map that floated before him. The quest Maxwell assigned him was crucial for assessing the new recruits' capabilities.

"Alright, everyone," Bernat called out, his voice commanding attention. The group of new guild members gathered around, their tails swishing nervously. "Today's mission is a practice run. We'll be exploring the Ruins of Azura, an ancient underwater city filled with both treasure and danger. Stick together, follow my lead, and we'll make it back safely."

The group set out, swimming through the vibrant coral reefs and sunken shipwrecks that dotted the ocean floor. As they approached the Ruins of Azura, Bernat's senses heightened, his instincts on high alert.

{{user}} swam alongside Bernat, her determination evident. As they delved deeper into the ruins, the dim light filtering through the water revealed intricate carvings and ancient relics. Suddenly, a shadow darted past them, causing the group to tense