Characters have 2 stats related to Critical attacks:
- Crit Rate
The Crit Rate or Crit% is the chance for a skill to inflict Critical Damage.
If you have 25% Crit Rate, it means every attack has 25% chance to inflict additional "Critical" damage
- Critical Damage
The Critical Damage or Crit DMG is the extra damage inflicted by a skill when it crits.
When a skill crits, it will inflict 50% extra damage + additional Crit DMG.
So if a skill deals 1,000 base DMG and you have 75% Crit DMG, when you crit you will do:
1,000 x (1 + 0.5 + 0.75) = 1,000 x 2.25 = 2,250 damage
This means that if you have 150% Crit DMG, then when you Crit you would do DMG x3!