Crying Tide Natsumi Full Set Upgrade Guide: Material Preparation and Acquisition Routes

Tracking the Footsteps of Natsu
In the ocean breeze of Resonance of the Deep, a new 5-star Resonant, named Natsu, is about to make her debut. She will arrive with the tide in version 2.3, bringing her skills and exclusive weapon. To help her shine brightly in the game, we need to collect some special materials. These include her breakthrough materials, skill materials, and exclusive weapon materials. Let’s embark on a journey to find these materials together.
Where to Begin the Journey
If you want to level up Natsu from level 0 to 90 and max out her resonance, you’ll need to prepare the following materials:

Low-frequency Tidal Sail Core, like a gentle whisper of the sea breeze, required: 29
Mid-frequency Tidal Sail Core, like the rhythm of waves hitting the reef, required: 40
High-frequency Tidal Sail Core, like the climax of a tsunami, required: 52
Full-frequency Tidal Sail Core, like the final chapter of an ocean symphony, required: 61
Burning Osteoloss, like the sigh of an ancient dragon, required: 46
Daylily in Bloom, like the vibrant beauty of a seaside garden, required: 26
Golden Fleece, like the golden glow of the sun, required: 60
Refined Combustion Essence (Impure), like the first flames of a newborn fire, required: 25
Refined Combustion Essence (Coarse), like the growing power, required: 28
Refined Combustion Essence (Pure), like pure love, required: 55
Refined Combustion Essence (High-purity), like an eternal promise, required: 67
Special Resonance Catalyst, like a fateful encounter, required: 122
Shells, like seashells collected by the beach, required: 3,053,300

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Under the Moonlight of Lina Aquatower
Natsu’s exclusive weapon also needs our careful attention. To upgrade her weapon from level 0 to 90, we need the following materials:

Simple Shackles, like the first light of dawn, required: 6
Standard Shackles, like growing strength, required: 6
Modified Shackles, like skilled craftsmanship, required: 10
Custom Shackles, like a unique love, required: 12
Refined Combustion Essence (Impure), like the first flames of a newborn fire, required: 6
Refined Combustion Essence (Coarse), like growing strength, required: 8
Refined Combustion Essence (Pure), like pure love, required: 6
Refined Combustion Essence (High-purity), like an eternal promise, required: 20
Shells, like seashells collected by the beach, required: 330,000

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In the Tears of the Sighing Dragon
Burning Osteoloss can be obtained by defeating the Sighing Dragon. You can find the boss’s location and listen to its sighs through a guide.
In the Garden of Lina Aquatower
Golden Fleece can be collected in Lina Aquatower. It can also be purchased at the pharmacy “Rosemary” in the city of Laguna for 3,000 Shells, with a weekly limit of 15.