Undaunted passives, mages guild passives.

A food buff (bi-stat magicka and health or Witchmother's Potent Brew, I prefer WPB but this sacrifices almost 2k health so you'll need to be quick with Hardened Wards).All of the passives in resto/destro skill lines.All of the relevant passive abilities in class skill lines.The only things you need to pull off this build are: Atronach (magicka recovery) if you're using standard magicka-health food.Apprentice (spell damage) if you're using Witchmother's Potent Brew as food.1x magicka recovery and 2x spell cost reduction on jewelry.Shock damage on lightning staff (concussed status effect to be converted into Off Balance by your blockade of lightning for a 10% damage boost to those with the CP).Weakening on resto staff (reduce target's weapon and spell damage on hit, weave light attacks in between rapid regen & healing springs).All magicka on armor pieces (unless you want 1 health).Charged > Infused > Decisive > Powered on your lightning staff.Decisive > Infused > Powered on your resto staff.Divines > Infused on all armor pieces (run Infused on a big piece with a Health enchant if you'd like a bit of an extra safety net).The Earthgore set is amazing for no-death runs as well, because it'll potentially save somebody's life every 35 seconds unless they get oneshot. If you want to run the 'not confident' build but you don't have Earthgore yet, run the Beginner / Entry Level build until you can get your hands on it. Lich (you will very rarely drop below 33% magicka with all the heavy attacks you'll be filling your time with).Sanctuary (apart from a few encounters, like Valkyn Skoria in City of Ash II, you can't expect your teammates to be within 10 metres of you - just assume they'll be running around all over the place).Prayer Shawl (shields are so weak you don't even notice them).Gossamer (should be common sense but, don't let your ability to support depend on RNG).Burning Spellweave (using a flame staff instead of a lightning staff on your back bar sacrifices too much in terms of group support).Martial Knowledge (too much DPS-oriented, you'll get little benefit).War Maiden (5 piece bonus only buffs damage, try to avoid).Spinner's Garments (5 piece bonus only buffs damage, try to avoid).Other sets that work instead of Julianos: 5x Worm Cult (2x light armor pieces, 3x jewelry).5x Stendarr's Embrace (2x light armor pieces, 3x jewelry).5x Julianos (heavy chest, medium legs, 3x light armor pieces).The beauty of a sorcerer healer build is that you have your 'oh crap' emergency heal (twilight matriarch active ability) on both bars by default, allowing you to spend more time than usual on your back bar for dps and support.

Eso pet health bar