Lydia's inability to move was due to the people. Although they had recovered from their exhaustion, they weren't going anywhere. Lydia could now protect them better than before, but she was still tied to their safety, unable to leave the city's survivors behind.
"As a result, I won't be able to participate in the assault on the demon. Aside from the two holy knights who will remain as my guards, everyone else will take part in the attack," Lydia explained.
"Hmm," Ulrich groaned softly. The most powerful asset against the demon was the saint herself, yet she couldn't participate in the battle. It was a frustrating situation.
"Thanks to Sylas, we were able to channel the power of the holy sword. With the consecrated weapons and armor, we should be more than capable of fighting the demon."