Board Thread:Questions and Answers/@comment-30011748-20131223024024

This is a future response post for anyone who might ask how to level up BAs fast.

Step1: Get the Upgrade part 血の活性(刀身)大 [BloodGrowthUp(Blade-Large)]. Beware that this upgrade part decreases Overall Atk Power.

Step2: Fight Ouroboros and use chosen Blood Art on its leg-tentacles to inflict critical damage( use an elementless Blade).

Step3: Repeat until the BloodArt Growth meter levels up.


 * Note: This tactic may become boringly long and repetitive when it comes to harder to unlock Black-icon Blood Arts (like Buster Blade's ParringUpper black-icon Blood Art: Last Revenger which only has Growth levels 1 & 2). 