Planar Conflux

Relic weapons from the Caught in the Web raid can be upgraded to Planar Conflux weapons. This property allows any weapon from the raid to form a part of any of the three Planar Focus Item Sets. The upgrades are performed by acquiring 3 Commendation of Heroism and 375 Purple Dragon Knights favor and speaking to Mikrom Sum, the Purple Dragon Knights favor vendor in Eveningstar.

More information on PDK favor upgrades here Currently, the upgrades are bugged and only Antipode requires 3 Commendation of Heroism, while the other weapons only require 375 PDK favor. Feather_of_Sun's post stating that this is not WAI and will be fixed in Update 16 is here.