Overdraw (Ex): At fourth level, the true archer may take a penalty on his rolls to hit up to his base attack bonus, and add this amount to his damage.
He can overdraw his bow without ruining it? This class should also have the feature where you can keep your bow braced all the time without losing tension after a month.

Sorry, I got into bowmaking a few months ago, and now I can't read the PHB without noticing that the composite bows they draw aren't even composite. I should probably leave and go to back to the real-life weapons & armor thead now...

But props on working on an archer class. Does the Elemental Arrow damage increase by a dc every two levels after tenth? The wording isn't explicit.