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 April 2010
Can I bow Fields of the Dead to produce the three gold to pay the gold cost of it's ability? Relevant text: Maho Limited: Target a Personality in a discard pile and pay 3 Gold: Create a 2F/2C/0PH Shadowlands • Undead Personality.
Thanks, Mark
[Mod edit: Formatting. -ZF]
Brook Cunningham (rules official), 17 April 2010
Can I bow Fields of the Dead to produce the three gold to pay the gold cost of it's ability? Relevant text: Maho Limited: Target a Personality in a discard pile and pay 3 Gold: Create a 2F/2C/0PH Shadowlands • Undead Personality.
Thanks, Mark
[Mod edit: Formatting. -ZF]
Yes.
Checking the legality of taking an action (such as the card it's on being unbowed) happens during Announcement, which is well before costs are paid (which only then would bow the Stronghold).