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, 15 May 2012
Perfect Sacrifice Cost
0 Keywords
Dark Virtue • Perfection Text
Battle/Limited: Choose your performing Samurai: Give each Personality and Follower in his unit a Force bonus equal to its current Force. Before this turn ends, destroy his unit.
At Any Cost Cost
0 Keywords
Dark Virtue • Will Text
Battle: If you control any units at the current battlefield, choose your performing dead Samurai: Bring him into play at the current battlefield, paying all costs.
Now question to you fine folk: Perfect Sacrifice does not specify exactly when you are supposed to blow up your guy. In reading it as such, am I able to choose when during the turn I destroy my unit (read, after the resolution of that battle so I can At Any Cost him into another one)?
Alex Jones (rules official), 15 May 2012
Perfect Sacrifice Cost
0 Keywords
Dark Virtue • Perfection Text
Battle/Limited: Choose your performing Samurai: Give each Personality and Follower in his unit a Force bonus equal to its current Force. Before this turn ends, destroy his unit.
At Any Cost Cost
0 Keywords
Dark Virtue • Will Text
Battle: If you control any units at the current battlefield, choose your performing dead Samurai: Bring him into play at the current battlefield, paying all costs.
Now question to you fine folk: Perfect Sacrifice does not specify exactly when you are supposed to blow up your guy. In reading it as such, am I able to choose when during the turn I destroy my unit (read, after the resolution of that battle so I can At Any Cost him into another one)?
No.
"Before the turn ends" is a precise timing trigger. Think of it as "immediately before the turn ends", or "when the turn is about to end".
See Timing, Triggers for more information.