Originally Posted by
Jallorn
Well, Tattooed Monks wouldn't have casting unless they multiclassed, Dragonslayers don't need spellcasting, but will most probably have a full casting class if they do, and Clerics are full casting classes, so they get more out of a boost in spellcasting level, and don't need as many.
Maybe make it every odd level gives a boost to any half-casting class, (so Paladin, Ranger, etc.) that may be the same or different from the other casting boost.
I'd do more critiquing, but I can't focus and I have a pretty bad headache.