Rooting An HTC Droid DNA Phone on Verizon Network
I know this is late, and you probably have already rooted it. I'm going to go ahead and answer this for other people's benefit.

I understand the problems, because I have an HTC One M7, Verizon branded. Kingroot
(Which can be found here) worked for my Samsung Galaxy S3, which was running Kitkat (4.4.2). If that one does not work, try Kingoroot.They are both reliable, and should work. If you want functionality, use kingroot, but if it is a good UI, use kingoroot. They both are similiar, so it should not matter too much.

Hope this helps.

PS.

If none of that works, then you might want to cough up the $25 for Sunshine S-OFF. It should root , and S-OFF.