Quote Originally Posted by sanahtlig View Post
Test with Arthur then and record the damage of a specific kamihime and Arthur simultaneously. Arthur's passive attack buff should be significant enough to spot by itself. Two birds with one stone.

Edit: Actually no, these tests would have to be done separately due to the confounding factors.
You think 5% atk increase is noticeable enough in fluctuating damage numbers? Easiest way would be to wait until Shingen, since increase in burst gauge rise amount should be obvious to see.