From Compendium of Worldly Lore
When a samurai or other noble warrior is exiled from the service of his feudal lord, he may become a ronin—a masterless warrior cast adrift in the world, but still clinging to the remnants of his former life. Blade in hand, a ronin wanders from job to job, trying to stay one step ahead of his enemies—and the shame of his past.
The vast majority of ronin were once samurai; both game rules and theme tie the two classes together. As with the samurai class, the ronin prestige class has its roots in feudal Japan, but it’s an appropriate choice in any campaign world that includes an Asian-themed culture. “Ronin” is Japanese for “wave-man,” and ronin tend to be inveterate wanderers. Even if an Asian setting isn’t an important part of your campaign, a ronin character may be a traveler from a distant land, eager to put his dishonor behind him and live out his days in a land where no one knows the code of bushido.
Ronin are often found in the pay of less scrupulous feudal lords. Because they are trained in the art of war, they are prized as mercenaries. Those who hire a ronin should watch their employee closely. Almost every ronin has a failure of honor in his past; most involve a conflict with their former masters.
Role: DPS
Characteristics: Exiled warriors that sneak attack foes and have frightening charges
Source: Complete Warrior
Game Rule Information
The Ronin has the following game statistics.
Abilities: Charisma is needed to mitigate infamy, Strength and Constitution for surviving your bold Banzai charges
Alignment: Any Nonlawful
Hit Die: d10
Starting Gold: N/A
Class Skills
The Ronin's class skills are Bluff (Cha), Craft (Int), Disguise (Cha), Intimidate (Cha), Knowledge (history) (Int), Knowledge (nobility and royalty) (Int), Listen (Wis) Ride (Dex), Search (Int), Sense Motive (Wis), and Spot (Wis),
Skill Points at 1st Level: (2 + Int modifier) × 4
Skill Points at Each Additional Level: 2 + Int modifier
Class Features
All of the following are class features of the Ronin.
Weapon and Armor Proficiency: A Ronin is proficient with whatever they were already proficient with prior to taking levels in this class.
Infamy: The ronin's reputation for dishonor—deserved or not—follows him everywhere. Whenever someone in a position of authority has heard of the ronin's past (usually through a DC 10 Gather Information or Knowledge (nobility and royalty) check), that person's attitude starts one category worse than usual, and the ronin takes a —4 circumstance penalty on all Charisma-based checks involving that person. The infamy penalty applies only if the authority figure knows the ronin's identity, so some ronin adopt pseudonyms or secret identities.
Sneak Attack Ex: If a ronin can catch an opponent when she is unable to defend herself effectively from his attack, he can strike a vital spot for an extra 1d6 points of damage. This extra damage increases by 1d6 points every third level (+2d6 at 4th level, +3d6 at 7th level, +4d6 at 10th level). For complete details on the sneak attack ability, see the Rogue page.
Banzai Charge Ex: The ronin has cast away the code of bushido and at least a measure of his own honor, but his heart still remembers the thrill of bravery. When a ronin of 2nd level or higher charges into battle, he can accept a variable penalty to his Armor Class and take an equivalent bonus on the damage roll. The normal —2 AC penalty for charging still applies and counts toward the bonus, but the ronin cannot accept a penalty smaller than —2 or larger than his base attack bonus. For example, a 2nd-level ronin making a banzai charge could take a —8 penalty to AC in exchange for a +8 bonus on the damage roll.
Bonus Feat: The ronin's experience in battle has taught him many tricks and techniques. At 5th and 9th level, a ronin may choose one feat from the following list: Far Shot, Improved Precise Shot, Manyshot, Mounted Archery, Mounted Combat, Point Blank Shot, Precise Shot, Rapid Shot, Ride-By Attack, Shot on the Run, Spirited Charge, Trample. The ronin must still meet all the prerequisites for the bonus feat.