each Class has 3 Defiant Items, a Ragnarok & Mutiny MH and an Insolence OH. here is a Post that shows you what each Weapon will be changed to using Jasper.
Ragnarok MH Weapons will have the Legend +200% Weapon Damage.
Mutiny MH Weapons will have the Legend +100% Elemental Damage.
Insolence OH Weapons will have the Legend +100% Elemental Damage.
this means 2 of the 4 OH for each Class will have Defiant.
all 4 MH weapons for each Class can have Defiant, but 2 of each Class will have the Legend WD% and 2 will have the Legend ED%.
most Players use a Defiant MH with the +200% WD, but if you like using a Defiant Weapon that has a +100% ED% on it, go for it.
hope this helps.