what i found in greymore patchnotes for perfected sets: Arena Weapons have all been adjusted to follow the same system as trial gear with the Perfected system. Normal arenas will drop the normal version of the sets, while Veteran will drop the Perfected version of these weapons. The perfected sets will now all grant the same special bonus as their non-perfected counterpart, but will have an extra set bonus of stats, equal to 4/5ths the density of a normal perfected set, since it requires less slots to obtain but also keeps in mind that this bonus will only be active on one bar. Almost all arena weapons have been adjusted to put them more in line with our set bonus efficiency standards.