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, 17 August 2007
Is the trait on Shinsei's Tomb triggered at a duels resolution?
Shinsei's Tomb After you discard a Ring: You may put it under Shinsei's Tomb.
Relevant Rule/Last Step of a Duel Discard all focused cards. End any changes to their Focus Value. Each player puts any cards remaining in his or her focus pool at the bottom of his or her Fate deck in any order. Duel resolution, and the duel, now end.
Thanks again!
- Art
Zen Faulkes (rules official), 17 August 2007
Is the trait on Shinsei's Tomb triggered at a duels resolution?
Yes.