I want to make a class that is forced to take the cat familiar, but at like 4th level the familiar becomes an animal companion functioning like a druids small cat one. I would want it to take away the ability to deliver touch spells and possibly the skill boost. Is this viable.
I was trying to think of a good starting point for something like this and I remembered the old 3.5 prestige class called the Arcane Heirophant. Maybe that could inspire something.