Physical attacks have a chance of dealing extra damage. The chance and the damage are based on LUK.
Crit chance: Minimum 1%. Every 1 LUK adds 0.5% to the crit chance. Crit chance is 50% at 99 LUK and 100% at 199 LUK, but there is some unknown condition for a unit to have less crit chance (by multiples of 5%).
Crit defense: Every 1 LUK subtracts 0.3% from crit chance of incoming hits.
Crit damage: Crits do 110%, then have a bonus of 1% per 2 LUK. The two factors are multiplicative.
- E.g. At 100 LUK, crits deal 110% * 150%, not 160%.
- E.g. At 99 LUK, crits deal 110% * 149%, not 149.5%.