Thank you! I'm glad you liked it.
The next Klondaeg book is currently in editing, and I think you'll be pleased to hear there's a whole episode devoted to Dalvinus. Clayborn also takes a larger role, but not with the same level of focus. Since you mention it, Acerbus actually has his own story already. It's called "Smite Me, Oh Dark One," and is available for free. Here's the Smashwords link:
https://www.smashwords.com/books/view/85061