If i bring out an Oboro and invest in her, do i shuffle all other copies of Oboro into my deck first or do i refill the province before shuffling the other oboros into the deck?
Oboro invest and refilling the province
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.
If i bring out an Oboro and invest in her, do i shuffle all other copies of Oboro into my deck first or do i refill the province before shuffling the other oboros into the deck?
You reshuffle first, then refill.
From the Comprehensive Rules, p18: When a card leaves a Province ... effects triggered by the card leaving the Province or entering play resolve first. Then ... it is refilled ...