"You'll stay behind and wait for my signs."
Lucy wanted to object but a gentle, harmless force pushed a few steps back. She didn't even have time to open her mouth before Arthur vanished, leaving an inky black fog in his stead.
Sure, her help would facilitate many things, however, she has to remain here and guard Lissandra. As for Vyncent, he's more than capable of defending himself, especially after getting a gear upgrade from the parasite.
The trio hid in a secluded area, bereft of anything, living or dead. They were a fair distance away from the Cthulhu base, which could be seen from their location.
Unlike his companions, Arthur recognized this place, this broken city, once prosperous and bustling with people of all races. He fought Claudia here and the aftermath razed the whole place to the ground, leaving a few, very lucky survivors.