I found http://forums.gleemax.com/wotc_archi...x.php/t-432709 this link and it says "x2 - change duration permanent to instantaneous" as an official factor.
I searched d20srd.org, Lost Empires of Faerun, Player's Guide to Faerun but I cannot find this factor anywhere. Is this official factor really exists? And where I can found this factor(in material, of course.)?