Want to sell prize boxes with weapons in them? Here are some suggestions that would show the F2Pers who is boss and make you incredibly rich in the process-
Weapons:
Irontech destroyer: replace stun with freeze or shock
Dread venom striker: Specialize its damage; change poison to freeze or shock
Obsidian Edge: Replace poison with fire or shock
Plague Needle: Replace poison with freeze or shock
Haze bomb: Curse; really curse anything would sell so do that for the lols
Electron vortex: replace shock with freeze
Overcharged mixmaster: Change to piercing, shock becomes stun -or- change to shadow, add fire
Shields:
Omega shell, but with any status resistance added
Swift strike buckler, but not ugly
Dragon scale shield, but with different statuses and different damage types
Armor:
Anything balanced with black kat/chaos
Weapons:
Fire/Shock Troika
Elemental Magnus with Shock damage
Elemental + Freeze Shard Bomb, make the initial explosion not cause Freeze damage, only the eight shards.
Specialized Winmillion -or- just a 5* Winmillion. Doesn't matter what damage and/or status you give it.
We already have Obsidian Carbine, why not make an Elemental + Fire/Shock Antigua?
Shields:
Royal Jelly Shield, replace Sleep with Freeze, preferably make it match Ice Queen.
Barbarous Thorn Shield reskins. That is all.
Armors:
Freeze + Shock defensive armor.
Helmet to match Radiant Silvermail.
Trinkets:
MSI Trinkets you know you want them. But only comes in 5* and only gives MSI Low.