The Serpent Riders are the Cavalry of LSD.
They all ride on mighty war-horses, which they rarely even step down off of. They are the ones who are there for retrieval and intercepting battles. Their quickness is what the rest of the guild counts on them for. The most important factor the SR are responsible for, is being a quick reactionary force, they are the ones who help trapped guild members in dungeons and other dangerous parts of Britannia and bring them back home safe. They are strong and well armored and can charge into battle and out within seconds striking mighty blows.