The history of the strange face can be partially explained by finding journal pages while collecting rewards from the Dominion Tower, which can be read here. According to a select few pages, it was created by someone named The Founder with powerful magic. The Founder's brother was mortally injured (how or by who was not specified) and The Founder offered to bind him to the tower. The brother accepted, and (with the help of their mother, who was an accomplished sorceress) The Founder's brother became one with the Dominion Tower.