By Shiva.Nikolce 2011-11-02 16:12:29
The retroactive part starts when you start the quest, so if you just started and finished the quest in a relitively short amount of time (<8 Hours)you gets nothing and are boned with no lube and no reach around, sorry about your luck, thanks for playing, etc..
But if you flagged the quest a long time ago and just finished now you get to do the happy dance of multiple stonegasm with the arms waving in the air and all that nonsense.
On the plus side either way you will build stones faster now than you did before doing the quest, just stop helping people get papers and stones and gems and stuff etc. that don't buy/farm the pop items/ki.