From Compendium of Worldly Lore
Vengeance knights are typically specially trained warriors who have pledged their service to a group of politicians and merchants with influence in governments. They are a special breed of enforcers used by the organization to cow their enemies into compliance. Fighters most often become vengeance knights, but blackguards and former paladins also make good fits because of their heavy armor use, horsemanship, and martial prowess.
Role: Tank DPS
Characteristics: Knight set on righting wrongs done to their employers
Source: Champions of Ruin
Game Rule Information
The Vengeance Knight has the following game statistics.
Abilities: . Strength (for melee combat), Constitution (for staying power), and Charisma (for intimidation) are key abilities for a vengeance knight.
Alignment: Lawful Neutral, Lawful Evil and Neutral Evil
Hit Die: d10
Starting Gold: {{{Starting Gold}}}
Class Skills
The Vengeance Knight's class skills are {{{Class Skills}}}
Skill Points at 1st Level: ({{{Base Skill Points}}} + Int modifier) × 4
Skill Points at Each Additional Level: {{{Base Skill Points}}} + Int modifier
Class Features
All of the following are class features of the Vengeance Knight.
Weapon and Armor Proficiency: A Vengeance Knight is proficient with {{{Proficiencies}}}
Armor Training Ex: As a vengeance knight, you always wear the heaviest armor available to you, and thus you learn to wear it more effectively through training. Your armor check penalty imposed by heavy armor and shields for all skills except Swim is reduced by 1, and you can don your armor as if you had help (although you still require a servant to help you don half-plate or full plate).
At 6th level, your armor check penalty for armor is reduced by 3, and you can make a DC 15 Constitution check to avoid being fatigued from sleeping in your armor. In addition, you take only half the normal movement penalty for wearing heavy armor.
At 10th level, you have truly mastered the art of wearing heavy armor. You can now sleep in your armor without penalty, and your armor check penalties for armor are reduced by 5. In addition, you can don half-plate or plate mail without assistance, although it takes twice the indicated time.
Bringer of Vengeance Ex: As an agent for your employer, you are often called upon to avenge some slight or to send a message to an enemy of the organization. Whenever you have a specific target, you gain the indicated bonus on Intimidate, Search, Sense Motive, and Spot checks when using these skills against your target. In addition, you gain the indicated bonus on all attack rolls and damage rolls against the target.
Counterstrike Ex: Vengeance knights visit pain upon those who would hurt them. As a result, you gain the indicated bonus on all melee attack rolls and damage rolls against any creature that damaged you in the previous round. This bonus stacks with that from your bringer of vengeance ability.
Improved Shield Bash: At 2nd level, you gain the Improved Shield Bash feat, even if you do not meet the prerequisites.
Bonus Feat: At 3rd and 9th levels, you can choose a bonus feat from the fighter's bonus feat list.
Arcane Backlash Su: At 4th level, any time you successfully save against any arcane spell when you are the spell's only target, the original caster takes 1d6 of nonlethal damage as you lash the energies of his failed spell back at him.
At level 7 this damage increases to 2d6, and at level10 it increases again to 3d6.