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, 16 February 2012
Reckless Rush:
Battle: Bow your performing Personality and target an enemy card without attachments: Bow it. Destroy it if it is an attachment or its base Gold Cost is 0. Before this battle's resolution, straighten your Personality.
If I have a terrain (lets say Heart of Darkness) in play, and my opponent plays Reckless Rush, can he target and bow my terrain? And if so, is it destroyed due to it having a 0 gold cost?
It probably doesn't matter, but here's Heart of Darkness:
Terrain Before this battle's resolution: Choose and bow zero to two cards at the current battlefield with 4 or greater Force. Battle: If no terrain is at the current battlefield: Put this card into play there.
Jon Palmer (rules official), 16 February 2012
Reckless Rush:
If I have a terrain (lets say Heart of Darkness) in play, and my opponent plays Reckless Rush, can he target and bow my terrain? And if so, is it destroyed due to it having a 0 gold cost?
It probably doesn't matter, but here's Heart of Darkness:
Terrains and other cards outside of units are not enemy cards.