Does anyone know if it affects the entire battlefield? People in our House who just obtained him say the visual only appears to impact the units directly in front of Yip, raising the question as to whether the ability is battlefield wide or not.

I think its only the units in the wind gust. Dont think its battlefield wide

The best way to test is put 24 archers on each end of the map with Yip on the far left corner, then attack an empty castle.

It’s a big column that is centered on him that covers about 30% of the battle field. It is cast immediately when Combat starts like war horn for Avalon. It lasts the entire duration of combat. At lvl5 it’s 22% enhance and reduced and 30% at 6, not sure about level 7 I only got to 22 with exp cards.