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, 29 January 2015
if i have Isawa Orinoko in play and invested, she dies, then at a later point on a different turn I recruit her from my graveyard and invest a second time.
is her cost now 5 and an invest cost of 20? or 15 with an invest cost of 10?
can i use a School of Wizardry to pay the full adjusted 15 gold for her and invest 10 from elsewhere? or will it still only pay the 5 and i would have to pay 20 from elsewhere?
if her cost is now 5 and an invest cost of 10, and i choose to recruit her from the graveyard and not invest, as invest is optional, do i just pay 5 and she would enter play with the fear 5 ability (as its a permanent change) or am i forced to pay the optional cost?
Alex Jones (rules official), 29 January 2015
if i have Isawa Orinoko in play and invested, she dies, then at a later point on a different turn I recruit her from my graveyard and invest a second time.
is her cost now 5 and an invest cost of 20? or 15 with an invest cost of 10?
can i use a School of Wizardry to pay the full adjusted 15 gold for her and invest 10 from elsewhere? or will it still only pay the 5 and i would have to pay 20 from elsewhere?
if her cost is now 5 and an invest cost of 10, and i choose to recruit her from the graveyard and not invest, as invest is optional, do i just pay 5 and she would enter play with the fear 5 ability (as its a permanent change) or am i forced to pay the optional cost?
When you Recruit Orinoko, you have the choice then to use the Invest trait, and permanently increase her cost by 10. From this point onwards, her cost is always 5 + 10: you do not get to choose whether or nor to pay that increased cost once you have chosen to increase it.
Each time after that that you Recruit Orinoko, you have another choice: whether or not to use her Invest trait again, and permanently increase her cost by another 10g.
The clause "This Invest cost cannot be reduced" is a modifier to the cost increase, it is not a separate effect. Thus, it does not have a separate duration to the cost increase.
If you have previously Invested Orinoko once, and Recruit her again with Invest, you must pay 25g, of which 20g cannot be reduced.