[Arts] Kneeling Shot: Fortress

* [Kneeling Shot] relocates four nearby pavises to form around the caster upon use, granting a shield to the caster that lasts for 15 seconds{nl} * The shield amount is equal to 25% of the caster's maximum HP for each relocated pavise, and after receiving the [Kneeling Shot: Fortress] buff, you cannot receive it again for 30 seconds{nl}