Ether Essence Cooking location in Lost Ark
Quest takes 2 days to complete below the steps:
1. Open Una's Tasks
2. Select Reputation Status tab
3. Accept and complete quest Mischievous Fairy quest on page 8
4. Do the quest again every day until you will receive the Magical Fermentation Boost
5. Go to Rothun and find on the bottom left side the Cooking Ingredient Merchant
6. Buy from this merchant the Azure Energy Concentrate
7. Speak with the cook and craft the Ether Essence