Some promoted classes, notably the Swordmaster and Berserker, have a Class Critical Bonus. This means that the class it applies to will always have a given chance for a critical hit, ignoring their Skill, Supports, and weapon factors.
The bonus first appeared in Fire Emblem: Binding Blade, where Berserkers and Swordmasters received an additional 30% critical hit chance, added to their initial Critical rate. In the following games, this bonus was reduced to 15%. In Fire Emblem: The Sacred Stones, Amelia and Ross have this type of bonus, but only when you promote them into a 3rd Tier Recruit or Journeyman.
This bonus was removed in the Japanese version of Fire Emblem: Path of Radiance, but it was restored in the American version, possessed by Swordmasters, Berserkers, and Snipers, giving an additional 15% critical hit chance for these classes. In Fire Emblem: Radiant Dawn, there were five levels of Class Critical Bonuses (Crit +5, Crit +10, Crit +15, Crit +20, Crit +25), represented as Skills permanently attached to the Sniper, Marksman, Reaver, Halberdier, Sentinel, Whisper, Assassin, Myrmidon, Swordmaster and Trueblade classes.
In Fire Emblem: Shadow Dragon, Berserkers and Snipers receive a 10% and 5% bonus respectively. Strangely, the Swordmaster class has not been awarded this innate skill, even though their class descriptions describes them as having tremendous Crit.
In Fire Emblem Awakening, the innate crit bonus is removed from all classes.
In Fire Emblem Fates, the bonus returns for both old and new classes. Berserkers get a 20% crit bonus. Swordmasters, Spear Masters, Sorcerers, Witches, and Snipers get a 10% crit bonus. Finally, Wolfssegners, Nine-Tails, Lodestars, and Master Ninjas get a 5% crit bonus.