While Barrow-wight is engaged with a player, that player's threat cannot be reduced.

Forced: After Barrow-wight attacks and destroys a character, that character's controller raises his threat by 2.

While Cold-wight is engaged with a player, that player cannot draw cards from card effects.

Forced: After Cold-wight attacks and destroys a character, that character's controller discards a random card from his hand.

While Dark-wight is engaged with a player, that player's heroes cannot gain resources from card effects.

Forced: After Dark-wight attacks and destroys a character, that character's controller discards all resources from each hero he controls.