Starlight Aura
Three things to note about the aura.
1) Its capacity is directly related to your Lunar Magic and scales pretty high. The floor of the system is at 20 ranks of Lunar Magic (below that you're just given the value of 20 ranks as a courtesy). Your aura will have double its original capacity by 40 ranks, and it will continue to grow until you hit 1000 ranks.
2) Its regen is directly related to your Wisdom and each and every point in Wisdom contributes to the size of your regen pulse. It will double from its default (assuming a 0-mod race) at around 40 Wisdom and continue to grow in perpetuity (though there's a practical limit to how much you'll want to invest into Wisdom).
3) Most aura costs are related to the mana you're putting into the spell. It costs more aura to power a 4-mana spell than a 2-mana spell.
So, when you're drawing on your aura in the early stages of your magic you want to be careful about how much mana you put in. Bearing in mind that early in a Trader's life (and for every Trader during this preview) they have free access to Analogous Patterns spells that cover every skill except Utility, which can be covered by Noumena at 2nd circle.
As your skills and stats increase, the aura's limits loosen up considerably and casting more powerfully and repeatedly under adverse conditions will become possible. By the time you lose access to the AP spells you should have enough Lunar Magic to notice a substantial improvement over Noobler's First Aura.