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, 7 June 2008
Okay the long Version:
I play The Last One sacrifice all my guys except one, and use the following ability;
Open: Target your Personality: Destroy all of your other personalities. If this destroyed at least four personalities, your target permanently gains +4 Force, and until the end of the game, other player's actions cannot bow, dishonor, move, or destroy him.
Now, say I Determination it three times. (reacting to each determination with the previous until the last targets The Last One.)
Would this mean it is impossible to for someone to determination through the negation effects on the card?
TL:DR version.
How long does Determination affect a permanent effect, such as The Last One?
Determination
Dark Virtue Reaction: Before you announce an action, target one of your Samurai: The action cannot have its effects negated or have it's targeting changes. After the action destroys any personality, remove him from the game.
Brook Cunningham (rules official), 7 June 2008
Okay the long Version:
I play The Last One sacrifice all my guys except one, and use the following ability;
Open: Target your Personality: Destroy all of your other personalities. If this destroyed at least four personalities, your target permanently gains +4 Force, and until the end of the game, other player's actions cannot bow, dishonor, move, or destroy him.
Now, say I Determination it three times. (reacting to each determination with the previous until the last targets The Last One.)
Would this mean it is impossible to for someone to determination through the negation effects on the card?
Whoever plays the most Determinations "wins", and equal amounts just ending up cancelling each other out (Citation). Thus, if you have played 3 on The Last One, there's no way in SE to "trump" that with more and stop The Last One's negation effects.
How long does Determination affect a permanent effect, such as The Last One?
Determination has no stated duration for its own effects, therefore they only last until the end of the turn by default.