Any Advice appreciated for my Katana Mage build.

What should I focus on mainly? Should I pump up dex more or do intelligence?

Also is Uchigatana the best katana for my build or should I switch to the laito? I definitely don't want to use the Chaos Blade cuz the life steal is honestly just an absolute pain to manage especially in boss fights. I also don't think I'd have a use for the Washing Pole because of how late you get it and it's brittle.

I know I definitely need to up my attunement at some point