The weapons are: Burning Fists (MNK), Sturdy Axe (WAR), Brave Blade (PLD), Death Sickle (DRK), Dancing Dagger (BRD), Radiant Lance (DRG), Scepter Staff (SMN), Windslicer (SAM), Quicksilver (COR), Inferno Claws (PUP), Sasuke Katana (NIN), Swordbreaker (THF), Double Axe (BST), Werebuster (WHM), Killer Bow (RNG), Vorpal Sword (RDM), Wightslayer (BLU), Mage's Staff (BLM), Elder Staff (SCH), Main Gauche (DNC). At Fan Festival 2007, it was revealed that the Nyzul Isle weapons have a purpose in some new relic weapons.
What is the effect or purpose of the Nyzul Isle weapons?
While still a few updates off, these items will be an ingredient to be used in new relic weapons with all new weapon skills.
A "Runic Key" key item is also rewarded to the player with the recorded data upon completing Floor 100. As of the June update, more light has been shed on the purpose of the item: "The reward for re-completing the 100th floor (by returning to the 100th floor via the key item received upon the first completion) has been adjusted." Completing floor 100 a second time results in an additional reward. If the player with the Runic Key clears a second Runic Disc up to floor 100, the floor 100 boss is guaranteed to drop the level 75 weapon for the job they are currently on.