Game description from the publisher:
Eastern Europe and the former Russian states are known as the birthplace of vampires, werewolves, and many fears that have been realized in Nightfall. Face those fears and bring tactics used in generations past to fight the darkness.
Nightfall: The Coldest War is a stand-alone expansion to the competitive deck building game Nightfall. The Coldest War brings you a complete, all-new set of cards with special powers and features a full set of 6 exciting new starting minions! The Coldest War also introduces Moon Phase cards that change the game globally as well as new, fully illustrated Wound cards.
Each card has a main color and two linking colors. If you can match the main color of a card to one of the linking colors of the previous card, you can chain those cards together. Once a chain is started, players all get an opportunity to link additional cards onto the chain during that turn.
Cards in the chain resolve in reverse order: first in, last out. Instant effects fire off as cards come off the chain, doing damage to your opponents or bringing characters into play to defend you and attack your opponents.
The object of Nightfall is to put wounds into your opponents’ decks and end the game with the least amount of wounds in your deck. But beware: the more wounds a person has, the more enraged they become and the faster their deck works, meaning more cards and bigger chains will come your way!