Though Declan is only 16 years old, this professional Duelist has been running Leo Corporation and the Leo Institute of Dueling (LID) as their president. As one of the select few who know about the existence of other dimensions, he forms the Lancers to protect this world from interdimensional invaders. He not only uses powerful Fiend-Type D/D and D/D/D monsters in his deck, he may be the only Duelist who has mastered four summoning methods: Fusion, Synchro, Xyz and Pendulum.
 D/D/D Doom King Armageddon | DARK Fiend ★8 ATK 3000 / DEF 1000 |
| Idea of Armageddon [UR] | |
| [ Pendulum Effect ] Once per turn: You can target 1 "D/D" monster you control; it gains 800 ATK until the end of this turn (even if this card leaves the field). [ Monster Effect ] Once per turn, if a monster(s) you control is destroyed by battle or by card effect: You can target 1 of those monsters; this card gains ATK equal to that monster's original ATK until the end of this turn. This card cannot attack directly the turn this effect is activated. Cannot be destroyed by Spell/Trap effects that do not target it. | |
Reach stage 6 in Yu-Gi-Oh! (ARC-V) World.
| Missions | Reward |
| Play as Yuya Sakaki and win 1 Duel(s) against Declan Akaba at level 30 in Duel World. | SR Jewel x3 |
| Summon a Level (Rank) 7 or higher Dragon-Type monster 3 time(s) in one Duel again Declan Akaba using Yuya Sakaki. | Gold x8000 |
| Perform 2 Fusion Summon(s) in one Duel against Declan Akaba using Yuya Sakaki. | Gold x8000 |
| Complete all Character Unlock Missions. | Blue Key x50 |
| [Skill] description | User |
|---|---|
| King of the Underworld Begin the Duel with 1 "D/D/D Doom King Armageddon" in your Deck. In addition, if you have 2 "D/D" Pendulum Monster Cards in your Pendulum Zones, the following effect can be used once per Duel. Add 1 "D/D/D Doom King Armageddon" to your hand from your Deck/Extra Deck. Then, return 1 card in your hand to your Deck. If you begin the Duel with a Deck/Extra Deck containing a total of 12 or more "D/D/D" monsters or "Dark Contract" Spell/Trap Cards, add Pendulum Zones to your field at the beginning of the Duel. | Lvl 1 |
| Balance Your starting hand will reflect the card balance of your deck. This Skill will not activate unless you have at least 6 of each type of card (Monster, Spell, and Trap) in your Deck. You cannot Special Summon or activate monster effects until the end of the Main Phase of your first turn. | Lvl 13 |
| D.D. King All "D/D/D" monsters you control gain 500 ATK until the end of the turn. This Skill can only be used once per turn and twice per Duel. If you begin the Duel with a Deck/Extra Deck containing a total of 12 or more "D/D/D" monsters or "Dark Contract" Spell/Trap Cards, add Pendulum Zones to your field at the beginning of the Duel. | Lvl 20 |
| Amnesia of the Savants Negate the effects of D/D Savant Galilei and D/D Savant Kepler in your Pendulum Zones until the Main hase of your next turn. This skill can only be used once per Duel. | Drop |
| Black and White Contract Can be used by sending 1 face-up "Dark Contract" card on your field to the Graveyard. Select 1 effect from the following and apply it to 1 "D/D" monster on your field. This Skill can be used twice per Duel if you begin the Duel with a Deck/Extra Deck that contains no monsters other than "D/D" monsters. ● The selected monster will become a Tuner monster. ● The selected monster will become a Level 4 monster. ● The selected monster will become a Level 8 monster. | Drop |
| Command of the Doom King At the beginning of the Duel, add Pendulum Zones to your field. The following effect can be used once per Duel. Select 1 D/D/D Doom King Armageddon from your hand and add it face-up to your Extra Deck. Then, select up to 1 "D/D" Pendulum Monster respectively from your Field/Deck and place it in your Pendulum Zone, but its effects are negated. At the beginning of your next turn, return all cards in your Pendulum Zones to your Deck. This Skill will only activate if you begin the Duel with a Deck that has 6 or more "D/D/D" Pendulum Monsters including 1 or more D/D/D Doom King Armageddon. (Extra Deck is not included.) | Drop |
| Contract Procrastination Can be used at the beginning of your turn if you have 1 or more "Dark Contract" cards on your field. Skip the Standby Phase on this turn. | Drop |
| Return from Another Dimensions Can be used if you have 20 or more banished "D/D" monsters. Place 1 face-down Return from the Different Dimension from outside of your Deck. During the turn you use this Skill, you cannot activate Spell/Trap Cards. This Skill can be used once per Duel if you only have "D/D" monsters in your Deck/Extra Deck. | Drop |
| End of the World Can be used once per Duel by revealing 1 "D/D/D Doom King Armageddon" in your hand to your opponent. Add 1 face-up "D/D/D" Pendulum Monster to your hand from your Extra Deck. Until the end of the next turn, you cannot Summon the card added to your hand by this Skill or cards with the same name except by Pendulum Summoning, and you cannot activate their effects. In addition, the following effect can be used once per turn on the turn you Pendulum Summon 3 D/D/D Doom King Armageddon at the same time from your hand. Destroy all monsters on the field except for D/D/D Doom King Armageddon. If you begin the Duel with a Deck/Extra Deck containing a total of 12 or more "D/D/D" monsters or "Dark Contract" Spell/Trap Cards, add Pendulum Zones to your field at the beginning of the Duel. | Drop |
| Reverse of the Underworld and D.D. Can be used once per Duel if the number of the "D/D" monsters in your Graveyard is the same as your banished "D/D" monsters. Banish all "D/D" monsters in your Graveyard when you use this Skill and return all your banished "D/D" monsters to the Graveyard. | Drop |
| Emergency Contract Launderings Send 1 Contract Laundering or "Dark Contract" card to the Graveyard and destroy all face-up "Dark Contract" cards on your field. Then, increase your Life Points by the number of destroyed "Dark Contract" cards x 1000 points. | Drop |
| Forbidden Contract Can be used if your Life Points are at 2000 or below. Change 1 face-up Dark Contract with the Swamp King on your field to Forbidden Dark Contract with the Swamp King. Can be used once per Duel. | Lifetime Mission |
 D/D/D Flame High King Genghis | DARK Fiend ★8 ATK 2800 / DEF 2400 |
| Declan Akaba at Lvl 35 [UR] | |
| 1 Level 5 or higher "D/D" monster + 1 "D/D" monster If another "D/D" monster(s) is Normal or Special Summoned to your field, while you control this monster (except during the Damage Step): You can target 1 "D/D" monster in your GY; Special Summon it. You can only use this effect of "D/D/D Flame High King Genghis" once per turn. Once per your turn, when a Spell/Trap Card, or its effect, is activated (Quick Effect): You can negate the activation. | |
 D/D Dog | DARK Fiend ★6 ATK 2000 / DEF 2000 |
| Declan Akaba at Lvl 33 [SR] | |
| Pendulum Effect You can target 1 Fusion, Synchro, or Xyz Monster your opponent controls; negate its effects until the end of this turn, then destroy this card. You can only use this effect of "D/D Dog" once per turn. Monster Effect Once per turn, if your opponent Special Summons a Fusion, Synchro, or Xyz Monster(s) (except during the Damage Step): You can target 1 of those monsters; this turn, that face-up monster cannot attack, also its effects are negated. | |
| Level | Reward |
|---|---|
| 1 | Skill: King of the Underworld |
| 2 | Gem x5 |
| 3 |  D/D Savant Nikola |
| 4 | Gems x10 |
| 5 | Deck Slot |
| 6 | Gem x15 |
| 7 |  Puppet Master |
| 8 | Deck Slot |
| 9 | Gem x25 |
| 10 |  D/D/D Stone King Darius |
| 11 |  D/D/D Human Resources |
| 12 | Gem x35 |
| 13 | Skill: Balance |
| 14 | D/D Savant Nikola |
| 15 | Gem x50 |
| 16 | Puppet Master |
| 17 | Gem x60 |
| 18 | D/D/D Stone King Darius |
| 19 | Gem x75 |
| 20 | Skill: D.D. King |
| 21 | D/D/D Human Resources |
| 22 | Gem x100 |
| 23 | Puppet Master |
| 24 | Gem x100 |
| 25 | D/D Savant Nikola |
| 26 | Gem x150 |
| 27 | Deck Slot |
| 28 | Gem x200 |
| 29 | Gem x250 |
| 30 | D/D/D Stone King Darius |
| 31 | Gold x100,000 |
| 32 | Gem x200 |
| 33 |  D/D Dog |
| 34 | Gem x250 |
| 35 |  D/D/D Flame High King Genghis |
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