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, 3 March 2010
If I use will to return senichi to a battle can I use his reaction. Is his reaction a once per game, once per turn or once per battle?
Akodo Senichi Reaction:Before another player's card's effect destroys one of your lion clan samurai personalities in senichi's army,destroy Senichi: Negate the personality's destruction. Gain 3 honor
Will Battle: if you control an opposed unit at the current battlefield,target your dead samurai personality. Bring him into play there, paying 2 less gold and ignoring honor requirements.
Zen Faulkes (rules official), 3 March 2010
If I use will to return senichi to a battle can I use his reaction.
I don't understand the question.
Is his reaction a once per game, once per turn or once per battle?
http://rules.l5r.com/CE_Abilities_and_a ... esignators: "(A)bilities can be used only once per turn, unless a different usage limit is stated." (Emphasis added.)