Warriors are a class in the Ways of Darkness franchise, although unlike the other classes, warriors may not be considered a true proper class, but rather an umbrella term for any character who prefers raw strength and/or martial arts to overcome enemies rather than magic or stealth. This makes the definition of "warrior" a rather broad one, as it also includes the everyday city guards who roam cities, the various mercenaries who fight wars, a good chunk of the highwaymen and bandits, the barbarians who still refuse to live a civilized life, etc. All of these people are warriors.
As such, it comes to no surprise that this is the most populous class.
In the original forum-based RPG, being a Warrior requires at least a Strength of 10, an Endurance of 12 and an Agility/Dexterity of 9. Being a warrior grants basis knowledge of archery, swordsmanship, the usage of blunt weapons and polearms, as well as armour-wearing. Warrior has a large amount of dual-class prestige classes: being both Warrior and Magician allows to be a Battlemage, being both Warrior and Cleric allows to be a Knight, being both Warrior and Druid allows to be a Ranger. The special prestige class Bard is also unlockable for Warriors.
In the video game adaptations of the FRPG, the class Warrior is akin to that of in JRPGs and early WRPGs - Warriors have the highest amount of hitpoints, base attack and defense. They can use every weapon and wear every armour, except ones specific to certain classes, races, characters or alignments.