Will it help if Astro have slow Effect add to Gravity?

[Archwizard]

I think it would be good for all healers to have an AoE with some DR or CC component. Pair Holy's Stun with Slow/Heavy on Gravity, perhaps some kind of brief accuracy/damage debuff on Art of War.
(SCH's reliance on shields mean less mileage on stall tactics compared to someone with a reliance on HoTs.)

A) It would add another level of parity to their AoE while still being unique enough from one another to not raise concern.
B) It would directly aid the healer's job, by reducing incoming damage during heavy pulls.

I like the mentioned idea for Gravity to have a draw-in effect... But I'm uncertain such a tool fits in the hands of a healer over a support-DPS, or even a tank.