Your ability to alter your spell of choice is greater than expected.
Choose: A spell of 3rd level or below.
Benefit: When you use the chosen spell with a metamagic feat, it uses up a spell slot one level lower than it normally would.
It is likely that the same clarification made for the Magical Lineage trait also applies to this trait but this has not been stated officially.
“This trait was never intended as a way for you to actually lower a spell’s level. It was put in to allow you to reduce the increase from a metamagic feat. So, no unlimited magic missiles. I will see to it that the language of this ability is clarified soon and I will get this added to the FAQ.”