A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 27 December 2012
Riddle of Rebirth Limited: Bow your performing Henshin, remove this card from the game, and target a Personality that shares a keyword with your Henshin: Put all cards in the target's unit at the bottom of his owner's appropriate decks in any order.
Assuming i have a monk/henshin/cavalry on my side and the opponent have 2 personality, Peep A has Cavalry / Monk and Peep B has Samurai / Cavalry.
When I use Riddle of rebirth, lets say I target peep A, do i have to announce that I'm targetting using the same Monk traits? If I dont, does that mean that the opponent may chugo seido the riddle to Peep B, to trigger the shared Cavalry keyword instead?
Jon Palmer (rules official), 27 December 2012
Riddle of Rebirth Limited: Bow your performing Henshin, remove this card from the game, and target a Personality that shares a keyword with your Henshin: Put all cards in the target's unit at the bottom of his owner's appropriate decks in any order.
Assuming i have a monk/henshin/cavalry on my side and the opponent have 2 personality, Peep A has Cavalry / Monk and Peep B has Samurai / Cavalry.
When I use Riddle of rebirth, lets say I target peep A, do i have to announce that I'm targetting using the same Monk traits? If I dont, does that mean that the opponent may chugo seido the riddle to Peep B, to trigger the shared Cavalry keyword instead?
There is no choice of a keyword, only a check to make sure they share one for targeting legality. Your opponent may redirect to any Personality that shares any keyword with your Henshin, not only one who shares the same keyword as the original target.