[RPG] Would the Life Cleric’s Disciple of Life feature work with the Necromancer Wizard’s Grim Harvest feature

class-featureclericdnd-5ehit-pointswizard

The Life Domain cleric's Disciple of Life feature (PHB, p. 60) says:

Also starting at 1st level, your healing spells are more effective. Whenever you use a spell of 1st level or higher to restore hit points to a creature, the creature regains additional hit points equal to 2 + the spell’s level.

The School of Necromancy wizard's Grim Harvest feature (PHB, p. 118) says:

At 2nd level, you gain the ability to reap life energy from creatures you kill with your spells. Once per turn when you kill one or more creatures with a spell of 1st level or higher, you regain hit points equal to twice the spell’s level, or three times its level if the spell belongs to the School of Necromancy. You don’t gain this benefit for killing constructs or undead.

Would the Life Cleric's Disciple of Life feature work with the Necromancer Wizard's Grim Harvest feature?

For instance, if I’m due to get 8 HP from Grim Harvest for killing a mob with a level 4 Spirit Guardians spell, do I get an extra 6 HP thanks to Disciple of Life?

Best Answer

No

Disciple of Life:

...Whenever you use a spell of 1st level or higher to restore hit points to a creature...

In this particular instance you are using a class feature to restore hit points. Despite being a derivative from a spell's level the spell itself is not what is healing you. When you "use" spirit guardians, it is to deal damage. The spell is not used to restore hitpoints, and as such doesn't trigger Disciple of Life the way Cure Wounds or even Vampiric Touch would.