From the Rokugan sourcebook:
Dancing with the Fortunes [Unicorn Technique]
Some Unicorn are incredibly lucky. You happen to be one of them.
Prerequisite: Cha 13+.
Benefit: Select a Fortune (see the Religion section). So long as you respect this fortune, he or she favours you. Once per day you may reroll one skill check, attack roll, or saving throw you have just made, but you must keep the new result. All modifiers to the original roll apply to the new roll.
Special: You may gain this technique multiple times, up to a maximum number of times equal to your level divided by three (round up). It may be used only once per roll. The Fortunes can be fickle, and if you disappoint your patron Fortune you will lose the use of this feat until you atone.
From OA:
Iaijutsu Focus (Cha).
Use this skill to gather your personal energy (ki) in an iaijutsu duel.
Check: If you attack a flat-footed opponent immediately after drawing a melee weapon, you can deal extra damage based on the result of an Iaijutsu Focus check. ... [+1d6 to +9d6 bonus damage, depending on the check result]
It is left as an exercise for the reader to adapt the above to an occidental campaign.
