Purchase the Advanced Skill Book of Food vs. Rat and Starfish. In the game "Food vs. Mouse", arctic shell turbulence drops charcoal and starfish, sea anemone current drops salt at night, tempura vortex drops starfish recipes, starfish advanced skill books can be obtained through temples, direct purchases, opening advanced ancient books, or It can be purchased in the level 2 guild mall for 900d, or it can be found in high-end ancient book box C with a probability.