What is the last book in the eragon series

I would read your spoilers.

I read the first two way back when they first came out. I tried picking up the 3rd years later but couldn't finish. Never bothered to read how it wrapped up.

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For a series that started out with decent promise it really found a way to end on a low note. I was extremely disappointed.

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I agree. I think the story got worse over the course of the entire series. That being said, I've read through all four books at least 5 or 6 times. It's like a guilty pleasure. Everyone in here is correct though in the resolution for Galbatorix was a real WTF moment. I'm sure Paolini thought he was being deep and emotional with it, but that final battle was probably the biggest letdown in any book I have ever read.