My two cents for this right now would be the Destruction Staves for vDSA.
I'd change it to be different for each element.
Frost: Frigid Impact:
(still reduces cost and adds damage) But also immobilizes two nearby targets for 4 seconds.
Fire: Searing Impact:
(Still reduces cost and adds damage) But also increases the Damage over time by 3000
Shock: Dispersion Impact:
(Still reduces cost and adds damage) But also damages enemies in a 3m radius for 1500 Shock Damage.