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 August 2012
Considering: viewtopic.php?f=59&t=98884&p=1304985&hilit=yoritomo%27s+guidance#p1304985
"Yes, any triggered traits should be announced when they trigger."
Is it still required to announce triggered trait from f.e. Yoritomo's Guidance (reducing PS after engaging) or Steel Soul Dojo (drawing a card)?
If Mantis player won't announce his Celestial's trait during engaging, enemy's provinces' strength will be not reduced automatically?
Source:
http://rules.l5r.com/EE_Card_features#Triggered_traits
Triggered traits happen every time that trigger occurs in the game Triggered traits are not optional – they must happen if the trigger occurs.
Jon Palmer (rules official), 8 August 2012
Considering: viewtopic.php?f=59&t=98884&p=1304985&hilit=yoritomo%27s+guidance#p1304985
"Yes, any triggered traits should be announced when they trigger."
Is it still required to announce triggered trait from f.e. Yoritomo's Guidance (reducing PS after engaging) or Steel Soul Dojo (drawing a card)?
If Mantis player won't announce his Celestial's trait during engaging, enemy's provinces' strength will be not reduced automatically?
Source:
http://rules.l5r.com/EE_Card_features#Triggered_traits
Triggered traits happen every time that trigger occurs in the game Triggered traits are not optional – they must happen if the trigger occurs.
This question falls more in the realm of the floor rules than the game rules. The trait will still trigger whether announced or not. However, if I as a judge had a player taking advantage multiple times of NOT announcing traits, then retroactively saying "oh this triggered", I would begin the warning procedure for that player.