Take a look below the Witcher 2: Assassins of Kings Enhanced Edition Melitle's Heart Side Quest in which it will show you how to complete it so you can advance in the game progress. This is one of many side quest that you will need to complete in the game. After completing certain side quest you will be giving help by increasing abilities and skills.
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The Witcher 2: Assassins of Kings (Enhanced Edition) Melitele's Heart Side Quest