Welcome traveler, let me pour you a hot cup of herbal tea. Put your tired feet in front of the fireplace and rest. You are safe here, here behind the old stone walls of the Crusaders fort.
Let me introduce myself, I am the scribe for this brotherhood.
You ask what they are? By all means, if you do not know, then let me tell you.

The Crusaders of the Sword and Chalice is a brotherhood of honourable knights. They fight for a greater good, a greater cause than petty gold or fame. They fight with honour and valor.
The Brotherhood fights in many ways. There are the users of the healing herbs and protection magic. Some use the sword with a strong arm and fierce temper. Others can wield the channeling powers of the true source of magics. Of course we also have the hidden assassin or spy among the people.

I can recommend you study some of the tomes I have here. It will be the best way to gather information about the Crusaders and their travels.