Quote Originally Posted by Ziegander View Post
Renew Item seems to be almost outrageously broken. I really like almost every change and addition you've made to the class, but once you hit 20th level you're handing out the equivalent of at-will Wizard spellcasting of whatever spells the Warlock can buy/find in Wands or Staffs.
Actually, no, it doesn't. The Renew Item ability specifies it only recharges per-day items, like Eternal Wands, and a lot of the stuff in the Magic Item Compendium that have daily charges. It's powerful, but not nearly as strong as you're thinking. Not a bad deal, by that level.

Quote Originally Posted by Ziegander View Post
On thing you really should do is come up with some new invocations (and probably shapes and essences) geared toward the various heritages, because as of right now half or more of the WotC ones are appropriate only for Demonic or Infernal Heritage.
Agreed here. Though I think generalizing the fiendish ones might not be a bad idea, adding generic flavor that can be bent towards a particular heritage.