At the heart of the Figal Salient, you'll confront Teresa Linares, a powerful Legate. Teresa is a skilled combatant who utilizes both sword and Malak Artes. She can be quite aggressive, so focus on guarding and dodging her attacks. Her Malak companion will also cast spells, so consider targeting it first to reduce incoming damage. Utilize your party's full range of Artes and Break Souls. Velvet's Break Soul, Consume Crow, is particularly effective for dealing high damage and recovering HP. Keep your party's HP topped up, and don't be afraid to use items. This fight requires good timing and strategic use of your abilities. Defeating her will open the path forward in your quest.
