I want to run Mask of the Oni soon, but I'm wondering how invocations for a shugenja PC are effected by being behind the Wall. If someone can point me to a page in one of the RPG books or could tell me how they have done it, that would be much appreciated. I assume that there are very few uncorruped kami's left in the Shadowlands and the further you go from Rokugan, the less number of kami's you will find.
Shugenja's in the Shadowlands
Primarily, all lands in the Shadowlands would have the Imbalanced (all elements) and Defiled terrain qualities, core rulebook p. 268.
So not too bad for shugenja.
The Mask of the Oni book also has rules for corrupted elements - which amongst other things pile on strife unusually fast.
Also anyone who normally attracts the attention of Kami will probably be interesting to Kansen, who apply afflicted to things they come into contact with.