User blog comment:Linathan/Unit Spotlight: Obsidian Seraph Zenia/@comment-24570336-20150723184914/@comment-26455864-20150723202056

Yeah. Some people are saying the spheres are rather lackluster, but the way I think of it is that the spheres are used in tandem with their ES, and since their ES's are better than most spheres, it's a fair, if not better trade-off (especially so for Zenia with that 80% ATK boost sphere).