This is my Warden Healer Trifecta Build, a general build for dungeon trifecta's as a Warden healer.

Attribute Allocation:
HP - 0
Magicka - 64
Stamina - 0

Race - Breton
Mundus Stone - The Atronach
Food - Bewitched Sugar Skulls
Potion - Essence of Spellpower/Tri-stat potion

Sets (Discuss with group to properly optimise)

SPC - Major Courage (430 Wep/Spell DMG)
Powerful Assault - 307 Unique Wep/Spell DMG
Monster Set - Spaulder (260 Wep/Spell DMG)
Perfected Restoration Staff of Grand Rejuvination
1-Piece Magma Incarnate Head - Light/Magicka/Divines

Alternative sets considered - MA/Ozezan/SoB

Skills:
Bar one (Resto Staff)

1 - Healing Springs - Good heal & procs Master's Resto Staff
2 - Enchanted Growth - Strong conal heal & grants Minor Intellect & Endurance
3 - Blue Betty - Good sustain & Self-purge
4 - Radiating Regeneration - Good, cheap HoT to upkeep 100% of the time
5 - Combat Prayer - Amazing front burst heal, grants Minor Resolve & Beserk
ULT - Reviving Barrier - Strongest shield in the game, additional heal & passive Mag Recovery

Bar two (Destro Staff)

1 - Elemental Blockade - Provides additional DMG, Off-balance, Concussed & minor vulnerability (If lightning)
2 - Budding Seeds - Amazing HoT & re-activate to burst if needed
3 - Energy Orb - Strong HoT & provides Healing Combustion synergy, restoring allies resources
4 - Expansive Frost Cloak - Group-wide Major Resolve
5 - Echoing Vigor - Good HoT, Stam dump & procs PA
ULT - Aggressive Warhorn - Huge DMG increase to be rotated between Tonk & Healer

Other abilities considered (depends on dungeon & boss fight), Enchanted Forest (Ult), Fetcher Infection, Mystic Guard, Crushing Shock, Overflowing Altar, Deceptive Predator.

Champion Points:

Warfare:

Enlivening Overflow
From the Brink
Hope Infusion
Rejuvinator

Fitness:

Celerity
Rejuvination
Boundless Vitality
Expert Evasion


Trifecta's Completed:

Apex Predator (MoS)
Pure Lunacy (MHK)
Bonecaller's Bane (UG)
Storm Foe (Icereach)
True Genius (Stone Garden)
Bane of Thorns (Castle Thorn)
Ardent Bibliophile (Black Drake Villa)
Subterranean Smasher (The Cauldron)
The Dreaded (Dread Cellar)
Of the Silver Rose (Red Petal Bastion)
Coral Caretaker (Coral Aerie)
Privateer (Shipwright's Regret)
Fist of Tava (Graven Deep)
Invader's Bane (Earthen Root Enclave)
Curator's Champion (Scrivener's Hall)
Temporal Tempest (Bal Sunnar)
Mountain God (Scalecaller Peak)
Depths Defiler (Depths of Malatar)
The Unchained (Black Rose Prison)
Nature's Wrath (Lair of Maarselok)

Current Trifecta & Conqueror Prog List & Order:

No Bone Left Unbroken (Fang Lair)
Escape the Grave (Moongrave Fane)
Relentless Raider (Frostvault)