I would reduce this further and say that a level 1 monk has already had his unarmed damage improved in this manner. A level 1 monk has already benefitted from an improvement that overlaps with anything that Improved Natural Attack would have given. Why is it better? Because a monk can keep improving this, whereas you can only take INA once for any particular weapon.seans23 said:At level 1, a monk's unarmed damage is 1d6. At level 4, his damage goes from 1d6 to 1d8. This is essentially improving his "natural weapon". The monk gets this enhancement again at 8,12,16, and 20. From my perspective, this is like a chain of feats, and improved natural weapon is the equivalent of the feat the monk receives at level 4. So even if I were to allow it, the benefit would only help the monk for levels 1-3.
INA is stupid. Go find a better feat.