In celebration to the Xy’mox’s Charity Cache event, starting with the next weekly reset, players will be able to opt-in for an extra fated affix for each Fated Boss!
Not much is known yet, if you will be able to pick whichever power you want or if it is set in stone which is the second affix per boss. All that is known is that this is optional, as many fights can get substantially harder by adding certain affixes.