This is their return to the Dimension World, but in it's evil counterpart! ENJOY!

It was night that Frisk decided to call it a night.

She was resting until some strange light consumed her in her sleep, as what was next was that she started feeling a cold ground. She woke up, and noticed something off. Really off.

She got up looking around, "Where I'm-"

"Were back the the Dimension World." She looked and saw Chara standing with his arms crossed.

(Cue: A town called Cordova)

Frisk looked around, as she asked "How did we get back here?" "Ask that question to the idiot you called Jaden." Chara told her. They started walking to somewhere. Frisk told him "Jaden's the one?" "Yes, he wouldn't stop moping about that Jesse kid that he made the portal to come back here. It brought other people here, but I can't tell which one." Chara answered nodding.

Frisk said "Jaden must've been nuts. Why is he even thinking of coming back here. And we don't even know what part of the Dimension World this is." She looked around, as she sees cold nights, a lone moon, and high and low ruins. "This is the Dark World part of this Dimension. And be very careful. If you lose a duel here you'll be sent to the stars." Chara told her.

Frisk asked him "What's does 'Sent to the stars' mean?" "That means dying." Chara answered. Frisk looked un-eased, as she said "That's good to know."

"Halt!" They looked and saw a guard like fiend woman came out from behind the rock. "Who are you?" Frisk asked.

"Snoww, Unlight of Dark World. What are you doing in this territory human?" Snoww asked her. Frisk answered "I'm looking for my friends!" "Well you'll have to get pass me." Snoww said as she readied a Duel Disk. Frisk readied her's, as Chara stepped back.

"LET'S GO!"

(Dueling Theme: The Followers of Darkness-The First-)

Frisk: 4000

Snoww: 4000

Let the duel begin!

Snoww 1st Turn:

Snoww drew, as she said "I will play, Shadowfiend Archfiend in attack mode!" A fiend appeared with sharp claws.

Shadowfiend Archfiend

Wind Type

Level 4

Fiend

ATK: 2000

DEF: 1600

The controller of this card pays 900 Life Points during each of his/her Standby Phases (this is not optional). When this card is targeted by the effect of a card controlled by your opponent, when resolving the effect, roll a six-sided die. If the result is 3, negate the effect and destroy the opponent's card. The Battle Damage this card inflicts to your opponent is halved.

"Archfiend...?" Frisk asked knowing what archetype that is.

"Yes, now I play Pandemonium!" The field transformed into a red stone ruins fit for demons.

Pandemonium

Field Spell Card

Neither player has to pay Life Points during the Standby Phase for "Archfiend" monsters. Each time a player's "Archfiend" monster(s) is destroyed and sent to the Graveyard, except by battle, that player can add 1 "Archfiend" monster from their Deck to their hand that is a lower Level than the destroyed card.

"Now I set this card face-down, and that ends my turn." Snoww ended her turn.

Frisk 1st Turn:

Frisk better be careful from this. "I draw!" She drew, as she nodded "I summon out, Royal Guard Captain - Undyne!" Undyne appeared.

Royal Guard Captain - Undyne

Dark Type

Level 4

Warrior

ATK: 1900

DEF: 1500

If this card is Special Summoned, destroy one card your opponent controls. If you discard a Spell Card, this card can attack twice.

"And I end with a face-down. Your turn." Frisk told her opponent.

Frisk: 4000

Snoww: 4000

Snoww 2nd Turn:

Snoww drew, as she said "I will cry on Terrorking Archfiend!" A big Fiend appeared.

Terrorking Archfiend

Dark Type

Level 4

Fiend

ATK: 2000

DEF: 1500

This card cannot be Normal Summoned or Flip Summoned unless you have an Archfiend Monster Card on your side of the field. The controller of this card pays 800 Life Points during each of his/her Standby Phases (this is not optional). When this card is targeted by the effect of a card controlled by your opponent, when resolving the effect, roll a six-sided die. If the result is 2 or 5, negate the effect and destroy the opponent's card. The effects of an Effect Monster that this card destroyed as a result of battle are negated.

"Now first Terrorking Archfiend will attack your warrior!" Snoww cried as Terrorking charged. Frisk cried "Not so fast! I play a trap! Mirror Force!"

Mirror Force

Normal Trap Card

When an opponent's monster declares an attack: Destroy all Attack Position monsters your opponent controls.

'So all monsters you control are destroyed." Frisk cried.

Snoww smirked as she said "Maybe but we will have to see." 6 orbs appear with a flame on 1 as she explained "Whenever Terrorking Archfiend is targeted by a card effect of yours I do a dice. If it's 5 or 2 say Good-Bye to Mirror Force." The flame rode alongside the numbers before stopping at 2.

Mirror Force exploded as Terrorking Archfiend destroyed Undyne as Frisk lost 100 Life Points. (Frisk: 3900) "Now it's Shadowfiend's turn by the way he can only inflict half the damage on you!" Snoww cried, as Shadowknight struck Frisk as she lost 1000 Life Points. (Frisk: 2900)

"Next I play this Trap, called Star Up!"

Star Up!

Normal Trap Card

Increase the Level of all monsters you control by 1.

"With this all of my monsters gain 1 level!" Snoww smirked, as the two fiends glowed.

"Now I am Overlaying the two fiend's together!"

"Overlaying?" Frisk asked as the two Fiends glow purple as they went into some kind of portal, as Snoww continued "With these two monsters I build the Overlay Network! I Xyz Summon Adreus, Keeper of Armageddon!" What appeared was a fiendish like warrior with two purple orbs around her.

Adreus. Keeper of Armageddon

Dark Type

Rank 5

Fiend/Xyz

ATK: 2600

DEF: 1700

2 Level 5 monsters
Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up card your opponent controls; destroy it.

"First Synchro Summoning, and now this!?" Frisk cried shocked.

Chara said interested "So these morons came up with their own summoning mechanic." "I will end my turn, and a face-down." Snoww ended her turn.

Frisk 2nd Turn:

Frisk drew, as she said "Okay. I will play, Fiend's Sanctuary!"

Fiend's Sanctuary

Normal Spell Card

Special Summon 1 "Metal Fiend Token" (Fiend-Type/DARK/Level 1/ATK 0/DEF 0). It cannot attack. Your opponent takes any battle damage you would have taken from battles involving it. During each of your Standby Phases, pay 1000 LP or destroy this Token.

Metal Fiend Token

Dark Type

Level 1

Fiend/Token

ATK: 0

DEF: 0

Special Summoned with the effect of "Fiend's Sanctuary". This Token cannot attack. Your opponent takes any battle damage you would have taken from battles involving this Token. During each of your Standby Phases, pay 1000 Life Points or destroy this Token.

"So I can call out a Metal Fiend Token!" A Field Token appeared, as she continued "Next I play Creature Swap!"

Creature Swap

Normal Spell Card

Each player chooses 1 monster they control and switches control of those monsters with each other. Those monsters cannot change their battle positions for the rest of this turn.

"This switches both of our monsters!"

Snoww stepped back "No!" Adreus, and the Metal Fiend Token jumped, as Frisk read the effect. "Hmm not bad. I activate Adreus's effect! By removing an Overlay Unit, she can destroyed a face-up card on your fiend, and I chose your Token!"

The Fiend fused one of the orbs into his dagger, as she slashed the token to pieces.

"Now your monster will attack you directly!" Frisk cried, as Adreus attacked Snoww. (Snoww: 1400) "That ends my turn." Frisk said.

Frisk: 2900

Snoww: 1400

Snoww 3rd Turn:

Snoww thought she couldn't do anything to save her but she can at least get a lot of Frisk's points. "I play a Trap! Fiend's Wrath!"

Fiend's Wrath

Normal Trap Card

Target 1 Fiend-Type Monster; Inflict damage to your opponent equal to the ATK of the targeted monster.

"This deals Adreus's attack points to you!" Snoww cried, as the darkness surrounded Frisk losing 2600 Life Points. (Frisk: 0300)

"That ends my turn." Snoww said out of optians.

Frisk 3rd Turn:

Frisk drew as she cried "Finish her off!" Adreus attacked again.

Frisk: 0300

Snoww: 0000

Frisk wins the duel!

Snoww got back up as she said "You may have won. But Brron my king will finish you off." She started glowing as she finished "You will regret messing with the Dark World Laws!" Snoww glowed brightly before exploding in dozen of particles.

"Brron? As in Brron, Mad King of Dark World?" Frisk asked. Chara sneered "Yeah, that guy always annoys me. We need to go to him?"

"Why?"

"He knows where Jesse, and Yubel are. So if he knows Jaden would most likely go to him." Chara answered, as Frisk nodded as they ran toward someone, unaware they were being watched by someone.

I know this chapter is short but it at least give a close view to Xyz Summoning. Be sure to review!