Filia swallowed her words in mid-sentence. Reflected in her eyes were several dozen arrows flying out of the sky that peeked through the open ceiling. Who knew when he had found time to fire them. Based on the fact that their trajectories precisely targeted Filia, however, it seemed unlikely that he had simply shot countless shafts into the air and waited for them to come down. Then, Filia noticed — the bronze arrows were transforming as they fell, becoming birds with metal wings and beaks.
“Are those... the Stymphalides, familiars of the western war god...?”
The sight of the arrows transforming one by one into giant birds with bronze-coated beaks, wings and talons was fantastical. As the birds were rushing at her full of bloodlust, however, Filia had no time to be fascinated.
“...Not half bad.”

Fate/Strange Fake: Volume 4, Chapter 12 ("Day 2, Morning")