Cro healer used for trials content. I have used a ton of variations of this build mostly in relation to the skill bar setups, but this is my go to for vet trial setups, for hard modes I modify as needed (more below). Jewelry enchants would be different were I using a breton or argonian, but since I am a high elf I go with 2 Mag recovery & 1 spell damage, for breton or argonian I would instead use 1 mag recovery & 2 spell damage. Frontbar enchant from the research I've done is a matter of preference, I went with frost as it can help improve brittle uptime.

Skill bar changes for certain scenarios:

Typically the most flexible slot in my experience is necrotic potency, while you will lose a lot of ulti-gen it is definitely a skill you can do without in many scenarios. Empowering grasp can be dropped if you are kiting and not with the group as you won't be able to hit anyone with it. Resistant flesh can be dropped if you don't need a single-target heal, but if you do go without it I would recommend taking off sustained by suffering and adding Necro-rez to the front bar to keep the living death passive "Near Death Experience" active. Blessing of protection should be swapped to combat prayer if no one in group is running Kinra's, but the wider radius, bigger heal, and better uptime on minor resolve is definitely preferable IMO. Renewing Undeath can be used in place of purge but requires a body to proc the purge effect which makes it somewhat unreliable, you can use your spirit guardian if you time it correctly, but efficient purge just tends to be easier to use.

vKA: First Boss - Slot Purge in for Necrotic Potency
Last Boss - Slot Remote Totem in for Necrotic Potency (gives group minor protection which helps a lot on bottom floor), you can add the Vateshran resto in this fight and it will greatly improve group sustain, slot quick siphon in for Resistant flesh or necrotic potency (move empowering grasp to backbar if swapping for potency).

vSS: Ice Tombs/Cages - Slot Healing Ward in for empowering grasp, make sure to equip vBRP Resto on frontbar

vCR+3: Group - ROJO w/ Spaulder - Move Energy Orb to frontbar for resistant flesh (slot necro-rez for passive), slot blood altar and bone surge into backbar in place of energy orb/necrotic potency. You could also just slot bone surge in place of resistant flesh though I prefer to move orb to frontbar.

vAS+2: honestly this needs a whole new page, only healing skills you keep would be spirit guardian and resistant flesh, otherwise you are slotting DOTs and blastbones for Z'en's. Swap mundus to steed or something to increase damage.

vRG HM: I don't know shit about fuck

vHOF: First boss/triplets - slot Purge in place of Necrotic Potency