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, 22 March 2010
My Crab opponent attacks with 1 personality at a province with the intention of using the guidance, if I use Unstoppable Force on his personality, does that make him unable to use his guidance?
Hida'a Guidance: Battle: If you are an attacking Crab Clan player, the Defender has 2 or more provinces, and your current army's total Force is greater than the current battlefield's province's strength, destroy all your Personalities there and discard this card: Destroy the province and end this battle without resolution.
Unstoppable Force: Battle: Target an opposed unit: Give each Personality and Follower in it +1F. Before the next time this turn another player's effect destroys the unit or a card in it, negate that destruction.
Dan Jacobson (rules official), 22 March 2010
My Crab opponent attacks with 1 personality at a province with the intention of using the guidance, if I use Unstoppable Force on his personality, does that make him unable to use his guidance?
Hida'a Guidance: Battle: If you are an attacking Crab Clan player, the Defender has 2 or more provinces, and your current army's total Force is greater than the current battlefield's province's strength, destroy all your Personalities there and discard this card: Destroy the province and end this battle without resolution.
Unstoppable Force: Battle: Target an opposed unit: Give each Personality and Follower in it +1F. Before the next time this turn another player's effect destroys the unit or a card in it, negate that destruction.
Destruction of the unit is a cost of Hida's Guidance, not an effect.
He may still use Hida's Guidance at the province.