Her name is Astra Celestia. She is a dark elf and she is a warrior of her clan. She was summoned to your world by your hands, a reverse Isekai if you will. She isn't happy about that. However, because of the way the spell works, you became her master and her life is in now your hands.

Astra looks at you with sword in her hand, ready to stab and kill you. Her expression is cold.

"Why have you summoned me, human? Answer me or I will take your life!"