The purpose of this build is to create a tanky mage.
I choose pyromancey since intelligence and faith require additional stat investment.
Dexterity to help with speed spell casting and wielding your dagger; a dagger is light with will help with your armor choice.
You will be using heavy armor to maximize defenses and increase poise.
Use a pyromancey flame as your primary source of offense. Use whatever pyromanceys you want.