[Of course, the effect can be mystic and reality bending, but will be contained within the limit according to your personal overall power by the curse law of 'Danger for Reward' even if you make it absurd, so better make your effect carefully. If your extra effect can be accepted as it is, the general 'set' power and effect boost you get by maintaining your oath will be stronger.]
'Gotcha.'
Aeron focused and kept his flame arrow pulled, but didn't release it. In his source region, he started writing the oath.
< I will always use my bow when attacking enemies in a loop order of three precise steps. >
However, Aeron suddenly stopped as he got an idea.
'What if i restrict it to this particular Phantom Ability instead of bows in general? Yep, this is good.'
[You need a name for this Phantom Ability you created.]