EARTH 1

When your opponent activates a card or effect (Quick Effect): You can send this card from your hand or field to the GY, then target 1 "Subterror" monster you control; negate the activation, then change the targeted monster to face-down Defense Position. You can target 1 face-up monster you control; change it to face-down Defense Position, and if you do, Special Summon 1 "Subterror" monster from your hand or GY, in face-up or face-down Defense Position. You can only use each effect of "Subterror Fiendess" once per turn.

EARTH 4

During either player's turn: You can send 1 "Subterror" monster from your Deck to the Graveyard; Tribute this card and at least 1 other monster so the total original Levels Tributed equal or exceed the Level of that "Subterror" monster in the Graveyard, and if you do, Special Summon that monster in face-up or face-down Defense Position. If a "Subterror Behemoth" monster is flipped face-up while this card is in your Graveyard: You can Special Summon this card. You can only use each effect of "Subterror Nemesis Warrior" once per turn.

EARTH 12

FLIP: You can change all other face-up monsters on the field to face-down Defense Position. You can only use this effect of "Subterror Behemoth Ultramafus" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

EARTH 7

FLIP: You can target 1 monster your opponent controls; banish it. You can only use this effect of "Subterror Behemoth Umastryx" once per turn. When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

EARTH 4

FLIP: You can add 1 "Subterror" card from your Deck to your hand, except "Subterror Guru". You can target 1 other face-up monster on the field; change that monster, also this card, to face-down Defense Position. This is a Quick Effect if you control another "Subterror" card. You can only use each effect of "Subterror Guru" once per turn.

EARTH 8

2 "Ancient Gear" monsters Unaffected by other cards' effects. During your Main Phase: You can inflict 1000 damage to your opponent. You can only use this effect of "Ancient Gear Howitzer" once per turn. If this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Ancient Gear" monster from your Deck, ignoring its Summoning conditions.

DARK 8

2 DARK Dragon monsters (Quick Effect): You can target 1 monster you control and 1 card your opponent controls; destroy them. You can banish this card from your GY, then target 1 DARK Link Monster in your GY; Special Summon it, but it cannot activate its effects this turn. You can only use each effect of "Borreload Furious Dragon" once per turn.

FIRE 8

2 Beast-Warrior monsters If this card is Special Summoned: You can inflict 200 damage to your opponent for each "Fire Formation" Spell/Trap you control. During the Battle Phase (Quick Effect): You can send 1 face-up "Fire Formation" Spell/Trap you control to the GY, then target 1 card your opponent controls; destroy it. You can only use each effect of "Brotherhood of the Fire Fist - Swan" once per turn.

LIGHT 5

2 Cyberse monsters Once per turn: You can Tribute 1 Cyberse monster; Spell/Trap Cards, and their effects, cannot be activated during the Battle Phase of this turn. If this Fusion Summoned card is sent to your GY: You can target 1 "Cynet Fusion" and 1 Cyberse monster in your GY, except this card; add them to your hand. You can only use this effect of "Diplexer Chimera" once per turn.

WIND 8

1 "Elemental HERO" monster + 1 WIND monster Must be Fusion Summoned and cannot be Special Summoned by other ways. If this card is Fusion Summoned: Halve the ATK and DEF of all face-up monsters your opponent currently controls.

LIGHT 10

2 Level 5 or higher Warrior monsters If this card is Fusion Summoned: You can add 1 Level 5 Warrior monster from your Deck to your hand. You can only use this effect of "Idaten the Conqueror Star" once per turn. Once per turn: You can discard any number of cards; this card gains 200 ATK for each card discarded. Once per battle, during damage calculation, if this card battles an opponent's monster with an equal or lower Level (Quick Effect): You can make that opponent's monster's ATK 0 during that damage calculation only.

WATER 4

2 monsters with the same Attribute but different Types Your opponent cannot target this card, or monsters on the field with the same Attribute as this card, with card effects. Once per turn (Quick Effect): You can declare 1 Attribute; this card becomes that Attribute until the end of this turn.

DARK 8

2 DARK monsters on the field, except Tokens If this card is Fusion Summoned: You can make this card gain ATK equal to 1 opponent's Special Summoned monster, until the end of this turn. Once per turn: You can target 1 Level 5 or higher monster your opponent controls; until the End Phase, this card's name becomes that monster's original name, and replace this effect with that monster's original effects. If this Fusion Summoned card is destroyed: You can destroy all your opponent's Special Summoned monsters.

EARTH 10

"Ancient Gear Golem" + 2 "Ancient Gear" monsters Must be Fusion Summoned. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card attacks, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step. If this card is destroyed: You can target 1 "Ancient Gear Golem" in your GY; Special Summon it, ignoring its Summoning conditions.

Spell Normal

Excavate the top 3 cards of your Deck, add 1 of them to your hand, also, after that, shuffle the rest back into your Deck. You can only activate 1 "Pot of Duality" per turn. You cannot Special Summon during the turn you activate this card.

Spell Quick

Discard 1 card; Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from either field as Fusion Material. Neither player can activate cards or effects in response to this card's activation.

Spell Field

When this card is activated: You can add 1 "Subterror" monster from your Deck to your hand. Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position. Once per turn, when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position, then you can negate the attack. You can only activate 1 "The Hidden City" per turn.

Trap Normal

Target 1 monster in your opponent's GY; Special Summon it to your field, but its effects are negated, then, you can banish 1 monster from both players' fields that have the same Type as each other. You can only activate 1 "Ice Dragon's Prison" per turn.

Trap Normal

Activate 1 of these effects, also, after that, Set this card face-down instead of sending it to the GY. ● Change 1 Set "Subterror" monster on the field to face-up Attack or Defense Position. ● Change 1 face-up "Subterror" monster on the field to face-down Defense Position. ● ATK/DEF of 1 "Subterror" monster on the field become equal to its combined original ATK/DEF until the end of this turn. ● This turn, activated effects of "Subterror" cards cannot be negated.

Trap Normal

Target 1 card your opponent controls and 1 card in their GY; send that card on the field to the GY, and if you do, Set the other card from the GY to your opponent's field. You can only activate 1 "Terrors of the Overroot" per turn.

EARTH 1

When your opponent activates a card or effect (Quick Effect): You can send this card from your hand or field to the GY, then target 1 "Subterror" monster you control; negate the activation, then change the targeted monster to face-down Defense Position. You can target 1 face-up monster you control; change it to face-down Defense Position, and if you do, Special Summon 1 "Subterror" monster from your hand or GY, in face-up or face-down Defense Position. You can only use each effect of "Subterror Fiendess" once per turn.

EARTH 4

FLIP: You can add 1 "Subterror" card from your Deck to your hand, except "Subterror Guru". You can target 1 other face-up monster on the field; change that monster, also this card, to face-down Defense Position. This is a Quick Effect if you control another "Subterror" card. You can only use each effect of "Subterror Guru" once per turn.

EARTH 8

2 "Ancient Gear" monsters Unaffected by other cards' effects. During your Main Phase: You can inflict 1000 damage to your opponent. You can only use this effect of "Ancient Gear Howitzer" once per turn. If this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Ancient Gear" monster from your Deck, ignoring its Summoning conditions.

DARK 8

2 DARK Dragon monsters (Quick Effect): You can target 1 monster you control and 1 card your opponent controls; destroy them. You can banish this card from your GY, then target 1 DARK Link Monster in your GY; Special Summon it, but it cannot activate its effects this turn. You can only use each effect of "Borreload Furious Dragon" once per turn.

WIND 8

1 "Elemental HERO" monster + 1 WIND monster Must be Fusion Summoned and cannot be Special Summoned by other ways. If this card is Fusion Summoned: Halve the ATK and DEF of all face-up monsters your opponent currently controls.

DARK 8

2 DARK monsters on the field, except Tokens If this card is Fusion Summoned: You can make this card gain ATK equal to 1 opponent's Special Summoned monster, until the end of this turn. Once per turn: You can target 1 Level 5 or higher monster your opponent controls; until the End Phase, this card's name becomes that monster's original name, and replace this effect with that monster's original effects. If this Fusion Summoned card is destroyed: You can destroy all your opponent's Special Summoned monsters.

EARTH 10

"Ancient Gear Golem" + 2 "Ancient Gear" monsters Must be Fusion Summoned. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card attacks, your opponent cannot activate Spell/Trap Cards until the end of the Damage Step. If this card is destroyed: You can target 1 "Ancient Gear Golem" in your GY; Special Summon it, ignoring its Summoning conditions.

Spell Normal

Excavate the top 3 cards of your Deck, add 1 of them to your hand, also, after that, shuffle the rest back into your Deck. You can only activate 1 "Pot of Duality" per turn. You cannot Special Summon during the turn you activate this card.

Spell Quick

Discard 1 card; Fusion Summon 1 Fusion Monster from your Extra Deck, using monsters from either field as Fusion Material. Neither player can activate cards or effects in response to this card's activation.

Spell Field

When this card is activated: You can add 1 "Subterror" monster from your Deck to your hand. Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position. Once per turn, when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position, then you can negate the attack. You can only activate 1 "The Hidden City" per turn.

Trap Normal

Target 1 monster in your opponent's GY; Special Summon it to your field, but its effects are negated, then, you can banish 1 monster from both players' fields that have the same Type as each other. You can only activate 1 "Ice Dragon's Prison" per turn.

Trap Normal

Target 1 card your opponent controls and 1 card in their GY; send that card on the field to the GY, and if you do, Set the other card from the GY to your opponent's field. You can only activate 1 "Terrors of the Overroot" per turn.