Precast: best in slot.
Midcast: best m.acc & recast in slot.
side benefit, best in slot for banishes, holy, Luminohelix, Shining/Seraph Blade/Strike, Flash Nova, and Primal Rend.
Best ring for trueflight ws set pretty much forever.
Grants a significant light damage affinity bonus that amplifies light based ws damage by 8-10%.
Test data: http://www.ffxiah.com/forum/topic/38352/power-rangers-a-guide-to-pewing/74#2779034