They only got about two-thirds of the way in before the palace defenses began to overwhelm them and they were forced to flee, but even this failed foray told them two very important things.
First of all, the royal treasury actually did hold one piece of the Key within its depths. The dagger, if Zorian was interpreting what his marker was telling him correctly. They would have to figure out a way to break into the royal treasury if they wanted to assemble all five pieces.
Secondly, trying to break into the palace caused an unbelievable amount of outrage. The palace guards followed them for hours after their failed intrusion, only giving up when Zach and Zorian descended into the deep reaches of the Dungeon to lose them. And even this only earned them a few hours of peace, during which a s
