She is one of the series' first antagonists and is responsible for most of the terrible events that have occurred in Silent Hill. Dahlia is the leader and a priestess of the Order, a cult that worships its own god and is devoted to engineering its birth. Although Dahlia envisions a "Paradise", the benevolence of the cult's deity is in doubt.
Dahlia is the abusive mother of Alessa Gillespie; she set Alessa on fire, gave her fourth-degree burns, and kept her in excruciating pain and suffering for seven years, all in the name of her God and religion. There are implications throughout the series that Dahlia would punch, physically abuse and lock Alessa in her attic for refusing to believe and pray to God in order to force her daughter into her religion.