The Event Horizon expansion provides a new way to play Catacombs Conquest. The Sword and Skull team card decks from the base game are replaced with the decks from this expansion. Each card has two shot sequences: a primary shot sequence that can be played immediately and a secondary shot sequence that must be activated by matching a "star sign" symbol. Each player has a set of five Leader cards that start the game face-up in front of them. Players then build their deck by choosing two sets of cards to play with from their team (fighters, spell casters, hunters, creatures, or explorers). Players must play a card from their hand (or flip over one of their Leader cards) to perform the card's primary sequence and may choose to play another card to activate the primary card's secondary shot sequence (a Leader card can also be used for this purpose). Anytime a player cannot draw a card, their discarded cards are reshuffled. The expansion adds the leech shot and new rules for the fireball, missile, and wave ranged shots. It also introduces the new "Dot" connector which enables *both* Character discs to perform a shot. The game features some new characters including the Dwarven Warrior, Siren, Oozing Maw, Stone Sentinel and Battle Robot.
Near Mint condition cards show minimal or no wear from play or handling and will have an unmarked surface, crisp corners, and otherwise pristine edges outside of minimal handling. Near Mint condition cards appear 'fresh out of the pack,' with edges and surfaces virtually free from all flaws. '
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Lightly Played (LP)'
Lightly Played condition cards can have slight border or corner wear, or possibly minor scratches. No major defects are present, and there are less than 4 total flaws on the card. Lightly Played condition foils may have slight fading or indications of wear on the card face. '
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Moderately Played (MP)'
Moderately Played condition cards have moderate wear, or flaws apparent to the naked eye. Moderately Played condition cards can show moderate border wear, mild corner wear, water damage, scratches , creases or fading, light dirt buildup, or any combination of these defects. '
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Heavily Played (HP)'
Heavily Played condition cards exhibit signs of heavy wear. Heavily Played condition cards may include cards that have significant creasing, folding, severe water damage, heavy whitening, heavy border wear, and /or tearing. '
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Damaged (D)'
Damaged condition cards show obvious tears, bends, or creases that could make the card illegal for tournament play, even when sleeved. Damaged condition cards have massive border wear, possible writing or major inking (ex. white-bordered cards with black-markered front borders), massive corner wear, prevalent scratching, folds, creases or tears. '