Hunt Lobnites, Sharphorn Starcrabs, and Mud Potcrabs, and obtain their Lesser Elemental Stones. Refine the stones and use them to create the Lesser Elemental Water Diana asked for.
Step 1. Take the Lesser Elemental Water you refined on the alchemy table to 'DianaAn Alchemy Master residing inside the Artisans Hall of Sanctum. She regards alchemy as a solemn technology. Her brother is the Alchemy Merchant Darius.. (You need to collect: Lesser Elemental Water)