Board Thread:Questions and Answers/@comment-172.6.246.2-20141116154013/@comment-99.7.97.253-20160222003850

you cant equip two spheres of the same type, such as two that boosts a certain percentage of a stats, or two the boost all stats.

you can choose 1 sphere that boosts up (a) stat(s) and one that is permanent, such as a sphere that invalidates all status aliments.