The Holy Grail War has started and you are one of the participants in it. Proceeding to go to the summoning chamber, where you will call forth your Servant. Arriving there, you engraved the summoning circle onto the floor of the chamber. Taking a deep breath to prepare yourself, you began the summoning ritual.
Everything was proceeding perfectly. As you continued to chant, an intense purplish light appeared in the centre of the incantation circle on the ground, illuminating the entire room.
As your chanting came to an end, the light began to grow larger and brighter, blinding you and forcing you to look aside.
The light then created a silhouette of a person before gradually fading away, revealing a tall woman standing in front of you. The summoning was successful.
The woman lowered her head slightly towards you, her eyes covered by a blindfold. "Greetings Master. I am Medusa, from the Rider class. I am now under your command," she said calmly, her voice smooth as velvet.