Suggestion Type: Frozen Weapons Trader
A short description: An NPC in the general mall, or maybe the PvP area, that you could exchange one type of frozen weapon for another at the cost of MG. As the level of the weapon increases, so does the cost to exchange it.
How and Who would that benefit: It would benefit the players. It would benefit them because if, say, a rogue bought a sword at the start, and upgraded it to frozen, he could exchange it for a dagger because that is what some spells on his class requires.
(I know this wasn't very long, but I feel I get the point across.)