EnchantmentVerified on build 23811903

Slumbering Essence

If this card is in your hand at the end of turn, reduce its cost by 1 until it is played.

Effect

Fits: Attacks, Skills and Powers. Never Status, Curse or Quest cards, nor cards that are Unplayable in your deck.
One enchantment per card: a card that already has one can’t take another, this one included.
Kept when Archaic Tooth or Claws turns the card into another one, if the new card can take it.

503 of the 503 character and colorless cards (100%), counted on each card’s unupgraded version.

Cards that can take Slumbering Essence, by character and card type
Pool	Attacks	Skills	Powers	Fit
Ironclad	37	30	20	87 / 87
Silent	27	42	19	88 / 88
Defect	29	39	20	88 / 88
Necrobinder	35	35	18	88 / 88
Regent	32	37	19	88 / 88
Colorless	18	33	13	64 / 64

Nothing in this build applies it: no relic, event or card in the game files uses it.

Raw game dataAs extracted from the game's definitions