[Ardratz]

The issue is simple, Vent Petale is only meant to work if you are dual wielding a sword weapon and a spear weapon and it does but it also works even if you are using two swords or two spears. It doesn't work if you just have one weapon equipped though. I checked my character screen with all of those combinations and the only time I wasn't getting the boost to skill and defense was when I had a single weapon equipped.