Dual Blade Mechanics

Smashing my head against a wall for hours trying to figure out how dual blader damage worked produced a few discoveries:

- The mirror image description is completely wrong. For some reason, it draws 80% of the weapon's damage range for flying assaulter and bloody storm while strangely doing 125% damage for tornado spin and bloody storm, completely unaffected by final cut and critical bonuses, even though it says 60%. Other skills' modifiers are unknown.
- Final cut doubles all non-mirrored damage and does not just add +200% to each hit.
- Thorns works as the description says, not giving an extra 100% like sharp eyes does. It's +250% for the caster, +125% for party members, 2.25x damage for magicians.

My God, Mirror Image, fu'cking why. If there's any Mirror Image DPS tables there, I'd have to rewrite them since I don't believe I updated them at all since finding out about this not multiplier garbago.