Abyss Dweller
Sea Serpent / Xyz / Effect
WATER / 
42 Level 4 monsters
While this card has an Xyz Material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; any card effects that activate in your opponent's Graveyard cannot be activated this turn.
1700/1400
CARD ID: 21044178
Powered by yugioh.wikia.com
| TCG Set | Symbol | Rarity | Low | Avg | Trend | |
|---|---|---|---|---|---|---|
| Abyss Rising | ABYR-EN084 | Super Rare | 1.20€ | 3.43€ | 5.02€ | |
| Premium Gold: Infinite Gold | PGL3-EN068 | Gold Rare | 1.40€ | 2.48€ | 3.36€ | |
| The Secret Forces | THSF-EN047 | Super Rare | 1.60€ | 2.32€ | 3.09€ |
This is the first TCG exclusive Sea Serpent-Type Xyz Monster, and the third TCG exclusive Sea Serpent-Type monster in general.
This card is a Xyz counterpart of The Dragon Dwelling in the Deep, having the same appearance and stats: Level/Rank, Attribute, ATK, and DEF.
The Dragon Dwelling in the Deep was also a TCG exclusive monster.
This could be also be the WATER counterpart to Dweller in the Depthsand The Thing in the Crater.
This card is a Xyz counterpart of The Dragon Dwelling in the Deep, having the same appearance and stats: Level/Rank, Attribute, ATK, and DEF.
The Dragon Dwelling in the Deep was also a TCG exclusive monster.
This could be also be the WATER counterpart to Dweller in the Depthsand The Thing in the Crater.
OCG Rulings
Detaching 1 Xyz Material from this card is a cost to activate the "any card effects that activate in your opponent's Graveyard cannot be activated this turn." effect.: Abyss Dweller
The "any card effects that activate in your opponent's Graveyard cannot be activated this turn." effect cannot be activated during the Damage Step.