this is a set of cards which i created for my fanfic, most of the cards in there should be pretty balanced i think. and just for referencing, the names of all the "ultimate monsters" (i.e. just about God card equivalents but slightly less broken) are actual names of Daemons.
===MONSTERS===
Nemesis Catalyst (700/1100) NEMESIS
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Nemesis/Effect
When this monster is destroyed, Special Summon 1 Level 4 or lower monster with "Nemesis" in its name from your hand or deck in face up Attack Position.
Guardian- Nemesis of Light (1000/1000) LIGHT
**
Fairy/Effect
As long as this card remains face up on your side of the field, your opponent cannot declare any other card as an attack target.
Golem- Nemesis of Earth (100/2000) EARTH
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Rock/Effect
This monster may be summoned in face up Defense Position. Pay 1000 Life Points to switch the ATK and DEF of this monster.
Nosferatu- Nemesis of Darkness (600/0) DARK
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Zombie/Effect
When this card is sent to the graveyard through Battle, Special Summon it to your side of the field in your next Standby Phase. Whenever this monster is Special Summoned in this way, discard the bottom card of your opponent's deck.
Zephyr- Nemesis of Wind (1300/0) WIND
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Winged-Beast/Effect
When this card is Normal Summoned, switch the Battle Positions of all monsters on the field. If a face down monster is flipped face up, no Flip Effects are activated.
Asmoday- Nemesis Herald (1800/1800) NEMESIS
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Nemesis/Effect
Send this face up card on your side of the field to the graveyard. Select 1 monster with "Nemesis" in its name from your deck and put it into your hand.
Leviathan- Nemesis of Water (3500/1700) WATER
*******
Sea Serpent/Effect
When this card is summoned, discard your hand. When this monster Battles with an ATK higher than a Defense Position monster's DEF, inflict the difference as Battle Damage.
Inferno- Nemesis of Fire (?/?) FIRE
*******
Pyro/Effect
This card can only be Special Summoned by removing all cards in your graveyard from play. The ATK and DEF of this monster is equal to the number of cards remove from play x 400. When the Battle Position of this card changes, destroy this monster.
Bronze- Metal Nemesis (1000/1000) EARTH
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Rock/Ritual/Effect
This card can only be Ritual Summoned through the Ritual Spell card "Bronze Ritual", and also by discarding 1 monster from your hand. When this monster is destroyed, Special Summon 1 "Silver- Metal Nemesis" and 1 "Gold- Metal Nemesis" from your deck.
Silver- Metal Nemesis (1000/1000) EARTH
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Rock/Effect
This card can only be Special Summoned through the effect of "Bronze- Metal Nemesis". When this card is Special Summoned, draw 1 card from your deck.
Gold- Metal Nemesis (1000/1000) EARTH
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Rock/Effect
This card can only be Special Summoned through the effect of "Bronze- Metal Nemesis". When this card is Special Summoned, discard 1 card from your opponent's hand.
Electrum- Metal Nemesis (2000/2000) LIGHT
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Rock/Fusion/Effect
"Silver- Metal Nemesis" + "Gold- Metal Nemesis"
This monster can only be Fusion Summoned. As long as this card remains face up on your side of the field, your opponent cannot declare an attack with a monster whose ATK is higher than 1000.
Void- Nemesis of Light and Darkness (1600/1600) NEMESIS
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Nemesis/Fusion/Effect
"Guardian- Nemesis of Light" + "Nosferatu- Nemesis of Darkness"
When this monster is destroyed or removed from play, Special Summon it to your side of the field during your next Standby Phase by paying 500 Life Points.
Pyrus- Firestorm Nemesis (?/?) NEMESIS
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Nemesis/Fusion/Effect
"Zephyr- Nemesis of Wind" + "Inferno- Nemesis of Fire"
The ATK and DEF of this monster is equal to the number of cards on the field x 1000. Remove this face up monster from play to destroy all cards on the field.
Mire- Avalanche Nemesis (500/5000) NEMESIS
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Nemesis/Fusion/Effect
"Golem- Nemesis of Earth" + "Leviathan- Nemesis of Water"
Discard 1 card to switch the ATK and DEF of this card. During your Standby Phase, pay Life Points equal to the ATK of this monster. If you do not, then send all cards on your side of the field to the graveyard.
Nemesis Inferno Dragon (2900/2500) NEMESIS
*******
Nemesis/Fusion/Effect
"Electrum- Metal Nemesis" + "Nemesis Catalyst"
This monster can continue to declare attacks as long as at least 1 monster exists on your opponent's side of the field.
Asmoday- Herald of the End Times (4500/4300) NEMESIS
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Nemesis/Fusion/Effect
"Nemesis Inferno Dragon" + "Asmoday- Nemesis Herald"
Increase this monster's ATK by 500 points for each monster with "Nemesis" in its name in your graveyard and out of play. When this monster attacks with an ATK higher than the DEF of a Defense Position monster, inflict the difference as Battle Damage. Negate and destroy all Trap card which affect this card.
===ULTIMATE MONSTERS===
One per deck (obviously), and by that I mean only 1 copy of 1 of the following cards may be included in your deck. yes, they are horribly destructive, but what did you expect?
GENERAL RULES:
These monsters aren't affected by your opponent's Spell/Trap cards.
Any monster effect used against them are instantly negated, and the monster removed from play.
Vassago- Nemesis of Destruction (4000/2000) NEMESIS
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Nemesis Entity/Effect
This monster can only be Special Summoned by removing 5 cards in your deck from play. Whenever this monster inflicts Battle Damage to your opponent's Life Points, search through their deck and remove 1 card from play. Your opponent's deck is then shuffled.
Abigor- Nemesis of Chaos (3500/2500) NEMESIS
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Nemesis Entity/Effect
This monster can only be Special Summoned by removing at least 5 cards or monster tokens (not including "Sheep Tokens" or "Lamb Tokens") on your side of the field from play. If you do not attack this turn, you may remove 1 card from your opponent's hand or field from play.
Andras- Nemesis of Terror (3000/3000) NEMESIS
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Nemesis Entity/Effect
This monster can only be Special Summoned by removing 5 cards from your hand from play. Any monster this card attacks is instantly destroyed if you remove 2 cards in your deck from play and skipping your next Draw Phase. No Battle Damage or effects are resolved if you use this effect.
Cimejes- Nemesis of Death (6000/0) NEMESIS
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Nemesis Entity/Effect
This monster can only be Special Summoned by removing 5 cards each from your field, deck and graveyard from play. This monster cannot attack in the turn it is summoned. When this monster inflicts more than 2000 Battle Damage to your opponent's Life Points, your opponent loses the duel.
Forras- Nemesis of Oblivion (0/6000) NEMESIS
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Nemesis Entity/Effect
When you have more than 15 cards in your graveyard, you may Special Summon this card by removing every card in your deck from play. During each of your Draw Phases, you may select 1 card from your graveyard, and put it into your hand. When you cannot take any more cards from your graveyard, you lose the duel.
Amaymon- Nemesis Incarnate (?/?) NEMESIS -> HOLY MOLY THIS IS POWERFUL O_o
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Nemesis Super-Entity/Effect
This monster can only be Special Summoned by removing all cards on your side of the field (Spell/Trap cards can't be chained), in your hand and in both graveyards from play. This monster's ATK and DEF is equal to the number of cards removed from the game (both you and your opponent's) x 500. You cannot conduct your Draw Phase as long as this monster exists on your side of the field. When this monster declares an attack, remove the top card of your deck from play. When this monster battles a Defense Position monster whose DEF is lower than this monster's ATK, inflict the difference as Battle Damage. When this monster destroys a monster through Battle, remove it from play instead.
===SPELLS===
End of Time
Normal
You can only activate this card when both players have cards out of play. Pay 7000 Life Points. Both players switch their decks with their cards out of play.
Nemesis Calling
Quickplay
Sacrifice 1 monster with "Nemesis" in its name on your side of the field to Special Summon 1 monster with the same Level from your hand.
Expendable Resources
Normal
Remove 10 cards from your graveyard from play. Draw until you have 6 cards in your hand.
Bronze Ritual
Ritual
This is used to Ritual Summon 1 "Bronze- Metal Nemesis" from your hand. You must also offer 1 monster from your hand as tribute.
Force of Destruction
Normal
This card can only be activated when you have 5 or more face up cards on your side of the field. Randomly select 1 card from your opponent's hand, and remove it from play.
Force of Terror
Quickplay
Switch the Battle Positions of all monsters on your opponent's side of the field. No Flip Effects are activated at this time. Your opponent gains 300 Life Points for each Effect Monster on the field.
Force of Chaos
Normal
Pay 1000 Life Points. Activate all face down cards on the field. If their effects cannot be resolved, or the timing is incorrect, negate the activation of the card and destroy it.
Force of Death
Normal
Remove the top 5 cards of your deck from play. Destroy all monsters on the field, and remove them from play.
Force of Oblivion
Continuous
This card remains on the field for 3 of your Standby Phases. As long as this card remains face up on the field, neither player can draw cards from their deck.
Elemental Chaos
Continuous
You may change the Attribute of any face up monster as long as this card remains on the field. The Attribute of a monster can only be changed once per turn.
Amaymon's Edict
Quickplay
When a card on your side of the field has been removed from play through your opponent's card effect, Special Summon any monster with "Nemesis" in its name from your deck or hand.
Berserk Attack
Quickplay
Select 1 monster on your side of the field that has attakced this turn. That monster may declare further attacks as long as there is a monster on your opponent's side of the field. Destroy the monster during the End Phase of this turn.
Nemesis Mirage
Normal
Special Summon as many "Nemesis Mirage Tokens" (NEMESIS/Level 3/Nemesis/300 ATK/1500 DEF) as you can onto your opponent's side of the field. When a token is removed from the field, inflict 1000 points of Direct Damage to your Life Points.
Nightmare Prison Cell
Continuous
This card can only be activated when you have "Nightmare Handcuffs" and "Nightmare Legcuffs" on your side of the field. As long as this card remains face up on the field, your opponent cannot draw any cards. When any of the 3 cards are removed from the field, destroy all 3 cards and remove them from play.
Nemesis Tribunal
Normal
You can only activate this card when you have 2 or more monsters with "Nemesis" in their name on your side of the field. Both players see the top card of their decks, and then sends them to the graveyard.
Nemesis Apocalypse
Normal
Remove all monsters in your deck from play. Then remove all Spell OR Trap cards from your opponent's deck from play.
===TRAPS===
Gathering of the Horde
Normal
You can only activate this card when 1 monster on your side of the field is destroyed in Battle. Special Summon 1 Level 4 or lower monster with "Nemesis" in its name from your deck.
Seething Nightmare
Normal
Pay 800 Life Points. Select 1 monster on your opponent's side of the field. Until the End Phase of this turn, that monster cannot activate any effects, attack, change its Battle Position, nor defend your opponent's Life Points.
Dark Dimension of Despair
Continuous
As long as this card remains face up on the field, both players must remove 1 card from their graveyards or deck from play during their own respective End Phases.
Nightmare Handcuffs
Continuous
As long as this card remains face up on the field, your opponent cannot Set a card. Pay 1000 Life Points during each of your Standby Phases. If you do not, then this card is destroyed.
Nightmare Legcuffs
Continuous
As long as this card remains face up on the field, your opponent cannot declare an attack with a monster on their side of the field. Pay 1000 Life Points during each of your Standby Phases, if you do not, then this card is destroyed.
Avatar of Vassago
Normal
When this card is destroyed while face down, Special Summon 1 "Avatar of Vassago" (NEMESIS/****/Nemesis/1900/1900) onto your side of the field.
Embodiment of Abigor
Normal
Discard 1 card, flip all monsters on the field face down. Until the end of this turn, any face up monsters on the field are automatically destroyed.
Andras' Mind Games
Normal
This card can only be activated when your opponent activates a card effect which discards a card from their hand. For every card your opponent has discarded so far this turn, draw 1 card from your deck.
Cimejes' Judgement
Normal
Randomly discard 1 card and remove it from play. Select 1 monster card in your opponent's deck, and place it face up. Your opponent's deck is then shuffled. When your opponent draws that card, destroy all monsters on their side of the field.
Forras' Dark Dimension
Continuous
This card can only be activated when "Forras- Nemesis of Oblivion" on your side of the field. As long as this card remains face up on the field, you may put 1 card into your hand during your Draw Phase that has been removed from play instead of from your graveyard.