Gramor gave her two options. Which surrendered all everything that she has and safely leave the dungeon boss's room. Or, die from their hands and spent most of their monster's cores for the revival process.
Emma smirked at him as she can't feel anything or huge pressure from this party. "Why I should do that? Plus, I'm pretty sure each one of you knows about me and what are my capabilities, right? Do you think just because of your numbers, you could win against me?"
She was not saying these for a bluff or to scare her opponents. She was just confident that she can win against them with her current power.
Of course, it came to Gramor's mind must be this woman was simply stating a lie since by looking at her. He can easily tell Herenia suffered from their battle. Aside from that, her blood stained her clothes which signified that she received deep wounds from the monster's attacks.