Ramaster
Adventurer
Isn't there a feat that boosts caster level by +X (I think +4) limited to character level? That sets a decent precedent for this kind of feat. I would suggest caster level is much more universal to a spellcaster than challenges (or smites or similar for other classes) per day is to a cavalier so maybe more than +4 is warranted, but a similar approach could work.
Yes there is! But it is 3.5 (it hasn't been reprinted for pathfinder, that I know of). I called on the trait as a precedent because it mirrors the feat so closely (if you take into consideration that Traits were advertized as "1/2 Feats").
I would advice against a "+4" cap, since "Challenges per Day" is much less powerfull than "Caster Level", as many broken campaigns proved.
In the end, Adimus, you are the DM so you should decide the power level of the feat.
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