Here's my feisty little dunmer's healer build for veteran dungeons:

Gear (7L; all with magicka enchantments):
5x Kagrenac's Hope (all Divines)
1x Molag Kena shoulder (Infused)
1x Torug's Pact (Divines)

Jewellery:
3x Willpower (all Arcane, one magicka regeneration and two spell cost reduction enchantments)

Weapons:
1x Torug's Pact restoration staff (Nirnhoned, absorb magicka)
1x Torug's Pact destruction staff (Nirnhoned, fire damage)

Healing/damage strategies:

- Activate Radiant Aura (once) and Mutagen (twice) just before starting or in between boss/mob fights. Also anytime in between if I get the chance.
- Combat Prayer to give the DDs some extra damage. If the group has survivability issues, I switch this out with Extended Ritual and tell everyone to stay within the circle.
- Breath of Life on both bars because, even after the nerf, it's an excellent emergency heal.
- Blazing Spear for some AoE damage, and Reflective Light to hit multiple targets for mobs.
- For bosses, I switch out Reflective Light with Dark Flare or a destruction staff spell. Also, keep Elemental Drain up.

Alternative skills:
- Harness Magicka instead of Elemental Drain to give a shield to myself.