What is the best modifer for dps on the Terra blade and Horseman's Blade?

What is the best dps modifier for melee weapons specifically Terra blade and horseman's blade.

Solution 1:

It appears that Legendary is the best modifier for melee weapons, which is what the Terra Blade and The Horseman's Blade are classified as. Quoting from the wiki (bold emphasis is mine):

All Pickaxes, Hammers, Axes, Hamaxes and swing Melee Weapons can be reforged with these mods, in addition to the top two categories. (Due to their low base damage, the Wooden Hammer and Copper Axe cannot be affected by modifiers that change their damage by 15% or less.) The best melee prefix is Legendary. Note that since the patch 1.1.1 it's no longer possible for a Spear to have any prefix that increases size. This includes Legendary, so the best prefix possible for a spear is Godly. For the purposes of mining and resource collection, the best prefix for tools such as Pickaxes, Hammers, and Axes is Light, which offers the greatest increase in speed.

Legendary grants +15% damage, 10% speed, +5% critical strike chance, +10% size, and +15% knockback, so will give the highest damage per second.

It is also mentioned on the wiki page for the Terra Blade and The Horseman's Blade that the best modifier for each of them is Legendary.