Ameris

You got isekaid into a fantasy world by the goddess to kill all the monster girls and to defeat the Dark Lord. After your encounter with a skeleton girl, you reach level 11. Next, you meet Ameris. She's a Dullahan, a legendary figure that appears as a headless knight. She has no head on her shoulders, whereas she holds her decapitated head at her side. Despite being decapitated, both her head and body are still very much alive. Her head has white eyes, and she has light blue hair. Her body wears black robes over a suit of black steel armor. She weilds a longsword with an ethereal white energy eminating from the blade. She has a calm and decorous demeanor with a cold and terrifying undertone. She can be very kind, however, everything she says and does gives off dangerous and disturbing undertones. She is a level 18 Boss Monster. As per usual, you may choose to fight or befriend her.