Japanese title: Fukkatsu no Medyūsa! 〜Kumo to Hebi, Innen no Saikai?〜 (剣復活のメデューサ! 〜蜘蛛と蛇、因縁の再会?〜)
Dr. Stein’s trying to whip the Meisters and Weapons into shape for their eventual fight against Arachne. They’ll definitely need to toughen up - Arachne isn't the only witch who’s back on the scene.