Enchantments

Level 3

Dark Feast: Dark +2. Dark on enemies reduces shadow resistance 1.5% per charge. At the start of your turn, reduce the cost of the cards in your hand by 1 (2) until they are discarded if you have 5 (20) Dark stack.

Frozen Dark: Dark +1. You have corrupted Cold cards (Find them at Magic forge). Chill on enemies max charge is 100. When you play a "Shadow Spell" card, apply 2 Scourge and 3 Chill to all monster. When you play a "Cold Spell" card, refund 1 Energy and apply 1 Dark to all monster. (4 times/turn)

Level 5

Curse Power: Heal yourself for 15% of the damage done. Dark on this hero explodes at 44 charges, cannot be dispelled unless specified, don't reduce Shadow resistance and increases All damage done 10% per charge.

PS: Can't transfer dark too.

Darkest Abyss: Dark +2. Dark on enemies increases the damage of the dark explosion by 5% per charge. Increase the 30% final damage of dark explosion.

Cards

And 20 more cards.

Cards List: Blizzard, Curse of Agony, Curse of Decay, Curse of Elements, Curse of Exhaustion, Curse of Fragility, Curse of Shadows, Curse of Torment, Curse of Vulnerability, Cursenomicon, Darkness Falls, Drain Life, Frost Nova, Frostbolt, Rain, Shadow Binding, Shadow Bolt, Siphon Life, Winter is Coming, Winter Orb.

PS: Some cards need the trait of Frozen Dark.

Perks

The fourth Chill perk: Chill on enemies increases Dark explosion 0.1 more damage per 20 charges.

And the third Dark's description.