Boon Luminary
The Minstrel's Luminary — Spear and Staff, boons and healing delivered through Radiant Forge instead of tomes.
Same stats, same 
Stability utilities and the same Honor and Virtues lines as the support Firebrand. What changes is the delivery: you cycle in and out of the forge instead of managing pages.
Why these traits
The Luminary line is built around one loop. 
Resplendent Weaponry grants boons to five nearby allies every time you equip a radiant weapon; 
Light's Gift adds Luminary's Blessing to that and gives you vitality. 
Persistent Blessing then refreshes that blessing and fires its healing when you leave the forge — so entering, arming and exiting are all support actions, not just a damage window. 
Illuminating Inspiration closes the loop by cutting your virtue recharge each time you equip a weapon.
Underneath, the chassis is the Firebrand support's: 
Indomitable Courage for the 
Stun break and Stability on the third virtue, 
Absolute Resolve for the three-condition group cleanse on the second, 
Master of Consecrations to keep 
Hallowed Ground up, and Honor's 
Writ of Persistence to make your symbols heal. 
Valorous Stance is the trait loop in skill form: casting it puts Stability and 
Protection on five allies, and while it is up, every boon you grant heals the ally you granted it to.
Gear reasoning
Full Minstrel's with 
Water, two 
Concentration and the same 
Mint Creme Brulee and 
Peppermint Oil as the Firebrand support — identical package, because the job is identical. Healing power and boon duration; nothing offensive.
Flock is the one real difference: it heals you and nearby allies off your healing skill and turns the overheal into barrier. 
Resolute Stance is a big self-heal that also heals allies and strips three conditions from them, so the relic fires on a button you were already pressing for someone else. 
Energy returns half your endurance on swap and keeps the dodges coming for 
Selfless Daring, and 
Frenzy pulls two seconds off every skill on your bar when you get a kill.
When not to run it
The forge is a cycle, and if you are inside it or out of it at the wrong moment you have nothing to press. Firebrand's tomes are the more flexible emergency button — three of them, opened on demand. If the squad wants a panic button rather than a steady stream, take a Firebrand. If it wants damage out of the Guardian slot instead, take Dragonhunter or Guardian.