Cersei Lannister might have unleashed a monster she can't control when she decided to arm the Faith Militants, according to the latest "Game of Thrones" season 5 spoilers.

Eugene Simon, who plays Lancel Lannister-Cersei's cousin and one of the more devout members of Faith Militant-talked spoilers for "Game of Thrones" season 5 to E! News as he said that Cersei's gamble to hurt Margaery Tyrell and wrest control of King's Landing will come back to haunt her.

He said, "Cersei is still trying to push her weight around, but she's lost her way, perhaps in the light of so many awful events that have happened in her life-the death of her child and father, the loss of her daughter to the folks in the south."

"She's a woman that is driven by pain and by hostility to those who wish to do her harm," Simon added. "In that, maybe she's lost her perspective on who her real enemies are, and who they could become. Whether or not the Faith are strong enough to oppose her, we'll have to see."

Aside from sleeping with Cersei, Lancel Lannister also has an ace up his sleeve because he knew that she was partly responsible for Robert Baratheon's death.

Eugene Simon teased more "Game of Thrones" season 5 spoilers as he claimed that the Faith Militant will get even more powerful.

"As more time goes by, the Faith Militant will need to evolve and make their ultimate purpose very clear. Right now, the Sparrows and the Faith Militant are saying, 'We serve the gods and the gods demand justice,'" he said.

"But what exactly that entails at this point is unclear. Lancel is going to be very intrinsic in demonstrating what exactly they're really about and what courses of action they're going to take," Simon added.

Watch out for more "Game of Thrones" season 5 spoilers which will be published here as they come along.