Slayers Try EP20 - A Hero's Advent? To Whom does the Young Girl Pray?

Lina and the gang goes to an old town that was once populated with a lot of people due to it's water and gold source, thinking that the last weapon might be there. Once all the gold (and the water) was gone, people left. Erulogs, one of Almayce's men, shows up and fights them. He end up destroying most of the town, which was sort of a good thing. Underneath the town, water was there hidden there that they were longing for, for many years now.