Spell Normal

Pay 1000 LP; Special Summon 1 Level 5 or lower Fusion Monster from your Extra Deck, but it cannot attack, also it is destroyed during the End Phase. (This is treated as a Fusion Summon.) You can only activate 1 "Instant Fusion" per turn.

Trap Normal

When a monster(s) is Summoned: Destroy all monsters on the field.

EARTH 8

FLIP: You can send 1 card from your Deck to the Graveyard. You can only use this effect of "Subterror Behemoth Phospheroglacier" 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.

LIGHT 4

If this card is Normal or Special Summoned: You can banish 1 LIGHT monster from your GY; draw 1 card. You can banish this card from your hand or field; add 1 Level 6 or lower WIND Beast monster from your Deck to your hand. You can only use 1 "Noble Knight's Shield-Bearer" effect per turn, and only once that 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.

Trap Normal

You can banish 1 "Subterror" monster from your Graveyard; for the rest of this turn, face-down monsters you control cannot be destroyed by card effects, and your opponent cannot target them with card effects. If this card on the field is destroyed by a card effect: You can add 1 "Subterror" monster from your Deck to your hand. You can banish this card from your Graveyard, then target 1 "Subterror" monster you control; change it to face-down Defense Position.

EARTH 11

FLIP: You can target 1 monster on the field; change it to face-up Attack Position if it is in Defense Position, also change its ATK to 0. You can only use this effect of "Subterror Behemoth Speleogeist" 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.

Trap Normal

Banish 1 Normal Trap from your Deck, except "Trap Trick", and Set 1 card with the same name directly from your Deck, also it can be activated this turn. You can only activate 1 Trap Card for the rest of this turn after this card resolves. You can only activate 1 "Trap Trick" per turn.

WATER 1

FLIP: Draw 1 card. During your Main Phase: You can change this card to face-down Defense Position. You can only use each of the preceding effects of "Mokomoko" once per turn. If this card battles a monster, neither can be destroyed by that battle.

EARTH 10

FLIP: You can discard 1 "Subterror" monster, and if you do, draw 2 cards. You can only use this effect of "Subterror Behemoth Stalagmo" 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.

WIND 6

If you control a Level 2 or lower monster, you can Special Summon this card (from your hand) in Defense Position. You can only Special Summon "White Steed of the Floral Knights" once per turn this way. When an opponent's monster declares an attack: You can banish this card from your GY, then target 1 card you control; negate the attack, and if you do, destroy that targeted card. You can only use this effect of "White Steed of the Floral Knights" once per turn.

WIND 3

If this card is Normal or Special Summoned: You can add 1 LIGHT "Noble Knight" monster from your Deck to your hand. You can only use this effect of "Horse of the Floral Knights" once per turn. Once per turn, during your Main Phase: You can Fusion Summon 1 Fusion Monster from your Extra Deck, using this card you control and other monsters from your hand or field as Fusion Material.

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

Activate 1 of these effects, also, after that, Set this card face-down instead of sending it to the GY. ● Send 1 monster from your hand or face-up field to the GY, and if you do, add 1 Flip monster from your Deck to your hand with the same Attribute, but a different name, as that monster before it was sent to the GY. ● Send 1 Flip monster from your hand or face-up field to the GY, and if you do, add 1 monster from your Deck to your hand with the same Attribute but a lower original Level, as that monster before it was sent to the GY. You can only activate 1 "Subterror Succession" per turn.

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 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.

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.

Spell Normal

Add 1 Field Spell from your Deck to your hand.

EARTH 5

2 Beast monsters If this card is Fusion Summoned or flipped face-up: You can Special Summon 1 Flip monster from your hand or Deck in face-down Defense Position. If this card is in your GY: You can banish 2 Flip monsters from your face-up field and/or GY; Special Summon this card in face-down Defense Position, but banish it when it leaves the field. You can only use each effect of "Master of Ham" once per turn.

Spell Continuous

Your opponent cannot target face-down Defense Position monsters you control with card effects. Monsters you control that were flipped face-up while this card was face-up on the field gain 1500 ATK/DEF. If this card in its owner's Spell & Trap Zone is destroyed by an opponent's card effect: You can target 1 monster in your GY; Special Summon it in 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.

DARK 3

Once per turn: You can change this card to face-down Defense Position. When this card is Flip Summoned: Target 1 monster your opponent controls; destroy that target.