Doors

The four doors make up a puzzle which you and Hecate solved. The correct door leads out of the stronghold in which you and Lucius defeated Paronomazein, and you encountered them soon after fleeing from some necromancers.

The Puzzle
One of the doors always lied, one of them always told the truth, one of them switched between truth and lies, and the green door was the bathroom. Which one led out of the stronghold had no correlation with what their roles were.

Because the blue and yellow doors told the truth in the beginning, Hecate quickly ascertained that the red door was the one that always lied. After some of your unsuccessful attempts to determine which of the remaining ones told the truth, you let Hecate do the work, because he's actually not an idiot. He asked the blue door whether the yellow one was the switcher, to which the door replied that he wasn't going to answer that. The yellow door then criticized him for being the switcher, and the blue door responded by saying that the yellow one, was, in fact, the switcher. Because the blue door lied about not answering the question, you found out that the yellow door, by process of elimination, must be the one who always told the truth.
 * Red door = Lies
 * Blue door = Switches between lies and truth
 * Yellow door = Truth
 * Green door = Bathroom