Healer that reduces healing needed by buffing the group for greater damage and recovery.

Use Seducer (5 items) and Magnus (3-4 items) sets at lower levels, then Healer jewelry (from Dragonstar Arena) & Julianos sets at higher levels.
Can use Worm Cult to buff group dps.
Use Master Restoration Staff, infused, with Inner Light active.
Use Apprentice mundus stone if spell power (damage) is below 1k without food/drink. Atronach mundus stone.
The swords should be nirnhoned with Torug Pact (from 7 Dragonstar Arena) and flame and disease enchantments.

Tips: 1) position teammates, 2) anticipate damage, 3) optimize group member dps, 4) balance your build for dps + heal, 5) don't heal so much (do damage to reduce healing)