The armoury was a large place that held different kinds of weapons and protective devices for soldiers. It was one of the important places for all knights who fought on the frontline during times of war like this era.
And even though the castle's armoury was much smaller than that of the army's since the castle's armoury was meant to be used by only the royal family, it was still known throughout the entire knight kingdom as one of the best armouries ever.
The reason for this distinction was simply because of the quality of weapons the castle armory offered. Not only were the weapons there rumored to be made with the best materials available in the whole continent, but some of the weapons were rumored to be magical one's forged personally by the only magical person to ever grace their territory, the heaven blessed, Mervin.