Thread:HorusDB/@comment-34578108-20190216084414/@comment-32271305-20190216085451

Yep, it would be +340%, the game has only slot available for Leader Skills. Even for "nuking leaders" (such as ATK +33% per Ki Sphere obtained) it works the same way, meaning that as soon as you collect those Ki Spheres, the game adjusts accordingly and the ATK boost gets added in the Leader Skill slot before everything else ;)