ok a short summmary:
Arena = Arena coins == Legend Accessories!
Job Temple = Gold/Silver coins = Legend set!
there are 4 uniques you can actually kill with 1 PT!
isis/anubis --> drop Gold coins and some Silver
Sekleth/Neith --> drop only Silver coins
With Arena coins you have to go to the Arena Manager in HT to buy Accessories you need like 3k for all 4 accessories (ISIS = Legend +3 the other i vorgott the name = Legend + 0 after upgrading)
The weapons you ll get per FgW quest but hope you know how it works!
the Set you can exchange at the Thief/Hunter Guild Manager in Alexandria (Thief in North Hunter in south)
you need like 94Gold and 227 Silver coins for immo and 50% of them for a destruction Set.
Immortality = Legend+3 after upgrade Destruction = Legend +0 after upgrade!
PS: i think since the pimpevent are the prices only 50% so you need only like 50 Gold and 113 Silver for Immortality and 28 Gold and 76 Silver for Destruction. But you can watch the Prices at the NPC's and since i m at work i can t watch the exact prices for you
fact is: you need an own 8er PT or 7 Friends OR you need lot of money xD
because if you re 112+ the mobs won t drop anything!