Tiant, the second-in-command
While she might look beautiful, Tiant is anything but beautiful on the inside. From the time before she came into Crimson Scar, she was power-hungry, wanting to be a leader. She sought it by murdering those that got in her way.

From the moment she entered the cult, she wanted to be the leader. She murdered plenty of dragons that got in her way in secret, until the day she was promoted into a second-in-command. Even though she is the current second-in-command, she is not satisfied with it, wanting to take the position of leader for herself.

She now plots her plans to topple the leadership in secret, waiting for the day that she could execute her plan.