You can also play this "damaging healbot" with Outworn Buckler. It works. I've build my Kind Wayfarer like this about:
Attributes
Mig 18
Con 14 (due to sacred immolation)
Dex 11
Per 10
Int 19
Res 6
Skills
Stealth 1
Athletics 2
Lore 7 (=10 with Viettros formal footwear)
Mechanics 0
Survival 10
Abilities
Flames of Devotion
Zealous Focus
Liberating exhortation
Inspiring Triumph (+7 to all defences for your party on kill)
Reinforcing exhortation
corrdinated attacks (if you don't have a priest and don't want to use scrolls to prevent dominated and confused afflictions: take aegis of loyality and righteous soul instead)
sacred immolation
Talents
Strange Mercy
Weapon and Shield
Weapon Focus (whatever you like)
Bears Fortitude
Spirit of Decay (if you dont want to use bittercut, take vulnerable attack)
Scion of Flame
Outlanders Frenzy
Gear
Outworn Buckler (durganized)
Bittercut (durganized, quality upgrade, corrosive lash)
Armor: whatever, but durganized
Gauntlets of Swift action
In my experience, strange mercy and inspiring triumph will trigger about once per encounter with this build (but not in the very easy ones), twice or thrice in tough battles with many opponents. The healing potential of this build is incredible. My priest never wastes his time by casting healing spells.
Take a ranged weapon in the second slot and when encounters begin, let the rest of the crew attack first (paladin may cast reinforcing exhortation, frenzy or whatever in the meantime)
and then attack the foe with the lowest endurance. You will have a good chance to get the +7 to all defences at the begining of the fight (most of the times for the whole party)
Although that build is very viable and a lot of fun, its definitely not optimal: without a potion, you don't reach 0 recovery. So it may be a better choice to use a one handed weapon that already has +20% attack speed and select vulnerable attack instead of spirit of decay. That way, you reach 0 recovery if you durganize the weapon, and the overall damage output
may be better. You might also argue that it is not worth using 3x Durgan Steel for this build because at least 50% of his damage output is due to sacred immolation. That depends of course on the rest of your party and whether they have a better use for the durgan steel.