If you have any facts/theories that give you a better percent chance of getting the perm item or the Gold on FOD please Post your Answers
Nobody has much for facts, besides that successful actions and total effect to EB ups your chances slightly. Many have theories, none have provided any conclusive results.
Additionally, many of those theories have been extensively tested, again, nothing is conclusive as to what the true algorithm is for the perm item drops. Simply keep joining and fighting, and hope you get it at some point. You could also start sending the devs cookies. I hear that works quite well.
You could always summon the spirit of THE Blade by standing in front of a mirror at the witching hour with 4 candles lit facing north, south, east and west. Then you spin 3 times as you chant THE Blade five times. The spirit will arrive. You must strike a deal with it or else it will kill you. Note: any deaths are not my fault. I assume no responsibility