Should the prayerbook be given to one of them and then have that instructor die before purchasing this incantation, the player can still purchase it from the Twin Maiden Husks for the same price, after giving them the respective tutor's bell bearing.
WARNING: Should both Corhyn and Miriel die before giving either of them the prayerbook then this incantation becomes unavailable for that character until a new Journey is started.
Effect
The caster kneels in prayer, healing HP equal to 420% of their Faith-based Incantation Scaling, and heals nearby allies for 210% of the same.
Nearby Revenants and Revenant Followers take damage equal to 50% of their maximum HP plus an additional 300 HP. This attack also breaks their Stance, causing them to become staggered.
Restores HP equal to 7.64% of Incantation Scaling for each FP spent.
The healing effect can be delayed indefinitely by holding the casting button, which is helpful if an ally is not yet within range.
Strategies
Lord's Heal is the second most powerful direct healing incantation, comparable to Heal from Afar, and is only outclassed by Erdtree Heal. However, its healing efficiency is only marginally higher than that of Heal, allowing Great Heal to retain a slight advantage over this incantation.
The healing amount is based on the Faith scaling of an equipped sacred seal. Seals that scale with other attributes will result in reduced healing effectiveness compared to those that focus solely on Faith.
This spell breaks the stance of Revenants and Revenant followers, allowing you to quickly cast it again for a potential quick kill.
Since the anti-revenant effect is applied through what's essentially a 0 Attack Power attack for all other enemies and objects, it can trigger the fire pillars in catacombs to move and remove illusory walls.
Trivia
Lord's Heal has the second lowest healing effectiveness per FP spent among healing incantations.
The third line of the description is slightly different from the previous, weaker healing incantations.
8,000 Runes by Brother Corhyn or Miriel, Pastor of Vows, after giving either of them the Two Fingers' Prayerbook.
55 FP per cast.
45 Stamina per cast.