The Warlord is the basis for all fighters on a battlefield. This is the individual to whom battle is life. They live or die by the sword. All soldiers both trained and untrained fall under this heading. They have achieved the highest perfection in fighting forms.
All military ranks and militias are by default warriors. Norsemen, Charioteers, Gladiators, Brigands, Skirmishers, Pikemen, Shieldmaidens, Militia, Samurai, Warmongers, and Centurians are all types of Warriors.
They are capable of using any weapon on the battlefield. They have use of even the heaviest weaponry such as double bladed battles axes and claymores in addition to any ranged weapon (obviously can't use a bow and two handed sword at the same time though).
Warriors are the only class allowed tower shields. At the rank of 3 a warrior can combine their specialized use of two handed weapons, combining the two handed weapon with a shield.
They get an arch type weapon for their rank. So in this regard they are allowed D3 on the meter. They have an innate ability to resist AoE (area of effect) Magic, yet they do not add any MR as it is already built into the meter when they select their class.