[Fern]

Essentially the idea is that if you're dual wielding katanas and have the required innate, offensive skills such as Kagekiri, Hirazuki, Raijinken, Sharenzan, Toiken (excepting Wazabane) would be costing 2M to use. But only if you are using two katanas at once.

The bonus wouldn't apply to Wazabane! I accounted for that stuuuuff.