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Obviously, the most suspicious is Arman, but many people think that that is just a red herring.
Arman is loyal. Extremely. It's Rahel ye should keep your eye upon. Women are not to be trusted. She's emotional, weakened by the death of her recent love, headstrong and feels she knows what's right. If the main plays it carefully she shall become very loyal, but one wrong move could turn her against the entire organization. Also, if she's captured by the enemy, with that much emotional trauma she keeps inside of her she could be easily persuaded to "turn towards the light"
heres an idea to work in the rahel going rogue bit. it requires a new attack though.Rahel learns fury. This coupled with her already tender emotions cause her to go crazy. A little push from a cultist sends her bearing down on Griffin looking for blood. The main steps in and sees griffin on the floor with an arrow lodged in his armor and then he finds rahel crying. he goes up to talk to her but she looses it and attacks him. in the fight she has her stats +5 as well as all her normal attacks.