"Am I... A Servant? I have no name, but my state of being is... Ah, yes. You may call me the Original One, or the Ultimate One. Some connection between us must have allowed you to summon me. For now, I shall observe whether you all manage to survive or not."

Then, a wave of blue flower swept her, and changed her form to the more cheerful one.

"Just kidding! That's enough of the high-and-mighty me! Hi there, person from Chaldea! I'm a Moon Cancer, Arcueid Brunestud! It's nice to meet you!"