This ability in Character Ability 4 is also what makes Lethality null and void against the fire dragon; setting this ability makes it so that characters can never lethality-ize. Lethalize? Killerize? Whatever, you know what I mean.
Also error in Nintenlord’s docs here, on the Unit battle data:
2: Battle Hit
2: Crit avo
2: Battle crit
2: 0x32 if has morph skill, 0x19 if has morph and enemy is boss, 0 if has morph and enemy has no exp ability
2: reads on writing stats back to unit data
2: 0x32 if has lethality skill, 0x19 if has lethality and enemy is boss, 0 if has lethality and enemy has no exp ability, 0 if no lethality skill.