How to build Donnel?

Hey guys!

I want to make a strong Donnel, looking to get him 5*+10. Currently running this weird "Just slap something on him for arena points"-build with neutral IVs.

What are some good builds I can run on him? I don't really like the gamepress suggestions. Especially considering weapon refinery, I was thinking about giving him something like Slaying Lance or Ridersbane, maybe even something weird like Berkut's Lance and Distant Counter. I definitely want to run Aether and dual rally for arena points though.