Ok i see where is the gate, but i went in every house in the hollow village but didnt found any key to open that door, maybe im just dumb but can you send me wich house it is ?there's a gate at the north of your villa. You can open it finding a chest in the hollow village (having the priest with you)
also, if you keep looking in the hollow village with the priest, you will be able to find an item to capture a hollow, an optional party member
Also thanks for the tips for capture the hollow, it worked