Firstly you won't have a chance to heal after the battle with the Tree Guardian, so if you can try to do so immediately. Another note, if Savyna was in your party in the previous battle, she will be replaced. She's a quick fighter so she will get the first attack. Don't worry though, she is rather weak. Savyna has a six hit combo that ends with Burning Arrow. Like I said, it's a weak attack, but it is capable of causing flames. Savyna has no elemental strengths or weaknesses, so go ahead and just attack. Savyna uses an attack called Healing Capsule near the end of the fight. It heals her of 330 HP, but that's really nothing that you can't handle in one turn. Also, TAKE A PICTURE OF SAVYNA! It is a one-time shot of her that will nab you a lot of cash.