Onyx
Onyx was in the shower when she felt it. It was faint, not close but not far either. She shut off the water and skipped drying herself, haphazardly shoving on as many pieces of clothing as she could manage. Astonishingly, the only thing she did wrong was but her shirt on backwards. She was still trying to fix it when she stumbled out of the bathroom. With only one arm extending out of her shirt she called to Archer.
"Archer, Archer!" She cried, "There's a mage nearby! Can you sense a Servant? Do we need to go closer for that? I can send a familiar to check them out. We probably don't want to make a scene so we'll need to find some way to lure them off..."
She was so excited her words jumbled up and she barely managed to keep herself speaking in English. It could just be a coincidence that there was another mage nearby, her keen magical sense made sure she would sense every one of them that came within a half a mile of her position, but if there was even a chance of finding a Master she was going to take it.