Unearthed Arcana: Warlock & Wizard includes the eldritch invocation Green Lord's Gift for warlocks, which reads:
Green Lord’s Gift
Prerequisite: The Archfey patron
The Green Lord oversees a verdant realm of
everlasting summer. Your soul is linked to his
power. Whenever you regain hit points, you treat
any dice rolled to determine the hit points you
regain as having rolled their maximum value.
If I take this invocation, does it only benefit healing from resting and potions, or would healing spells also be maximized? For example, my Warlock is multi-classing as a Cleric, so I have healing word. If I cast healing word on myself, would the roll effectively be (4 x spell level) + modifier?