Sorry for the threadromancy, but I have a related question.
Assume a level 4 Warpriest has used his swift action to grant a +1 enhancement bonus to his weapon.
At what point do I get to enhance my weapon with, say, Brilliant Energy? By reading the rules, it would take one swift action to grant the +1 for sacred weapon, and another swift action to grant Brilliant Energy. Is this correct?
And am I able to enhance with a special ability only if the weapon already has up to the bonus cost worth of +1 enhancements?
It isn't clear to me when the special abilities are able to be placed on the weapon, nor whether there needs to be X*+1 enhancement bonus already on the weapon to "buy" the special ability.