Heal shit. Breath of Life is best heal, but situational. It onl hits 2 targets and you can't control which targets it hits. Also the second target's heal is sub par at best. Also very expensive ability etc. Healing springs is AoE, so it heals all 3-4 targets, restores magic when used, very cheap, scales off of templar and Resto stave passives, and doesn't prioritize heals. However, all targets have to be in a small area, which is sometimes difficult to achieve depending on the boss fight. Rapid Regen should be used in bursts of 2, and should not be spammed. Keep both of ur circles down at all times whilst in combat (Cleansing Ritual and Restoring Focus, otherwise known as your 'house'). Punc. Sweeps is only slotted to grant the Aedric Spear passive; you don't neccesarily HAVE to do damage, but every bit helps. Mage light is slotted for more max magic, more magic recov, higher spell critical and more over-all damage and healing. Radiant Depression is OP as dick holes and should only be used when the target is below 50% health. As a healer I choose not to use mine until the boss is at 20%-30% because the lower the target's health is the more damage the ability does.

Before you enter combat, make sure you buff yourself with Degeneration and place down your House. Then double cast Rapid Regeneration on your allies to coat them in a strong heal over time. Try to remember to re-apply this ability roughly every 15 seconds. Luminous Shards is slotted primarily for the Aedric Spear passive, but is very useful for stamina and magicka builds alike. The Magic recovery the shards grant magic based players is negledgable at best, and should be weaved into your healing rotation for stamina based builds as often as possible.

You're ulti's are situational. You could swap out war horn for barrier if you need more recovery, but war horn is essenscial for boosting allies damage and base stats. Your back bar's healing ulti is used as a hybrid heal in-between Breath of Life and Healing Spring. It heals all allies in the area, regardless of their position in relation to you, and also heals them all at the same time.

Heal Shit.