My opponent has lost two provinces this game. I Denounced on stage Does he lose 5 or 6 honor?
Seven Stings Keep and Denounced on Stage
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.
My opponent has lost two provinces this game. I Denounced on stage Does he lose 5 or 6 honor?
He would lose 5 Honor.
In your example, using Seven Stings Keep's ability produces a single loss of 4, which Denounced would increase to 5.
http://rules.l5r.com/Glossary_F#For_each: "Proportional effects using the term “for each”, such as “Gain 1 Honor for each Samurai you control,” should be interpreted as a single effect rather than numerous separate effects. In this instance, a player controlling 3 Samurai would gain 3 Honor at once, not 1 Honor three separate times."