{1.) Demon Lord Raid PvE - Grid Duels (tentative name; story and Game/Event idea) (SPOILER)}
It's basically a PvE grid map dungeon crawler with a duel format that I was brainstorming, taking elements from other formats and games.

With Liberta at the forefront of Kaiba Corp innovation, some students have been invited to _________ to participate in an experimental game using VR/AR/SV(?). A castle raid against an evil demon lord. It would be students against AI opponents with the goal of reaching the throne room where the final boss - the lord - awaits.


=======THINGS TO KNOW FOR THE EVENT========

Each player (Master) starts the event with [16 + 1d6] Life Points, determined via a Diviner?
A Master's LP carries over in both the Overworld and Duels. Use caution.
Also at the start of the event, each player must create a "deck."

-----"DECK" BUILDING
For each Master's "deck," they must select a team of 15 (unique?) maindeck monsters, upto 5 unique Extra Deck monsters, and a combination of 15 (unique?) spells and traps.
- Normal/Quick-Play/Ritual Spells ONLY
- Normal/Counter Traps ONLY (or maybe NO traps at all?)
(I'll likely make custom spells and traps for this event.)

The ATK and DEF of monsters have been modified.
In this format, a monster's ATK and DEF are now 1 point for every 500 points that it had.

Ex:
Blue-Eyes White Dragon = 6 ATK / 5 DEF
Dark Magician = 5/4
Doomking Balerdroch = 5/4
Gaia the Fierce Knight = 4/4
Breaker the Magical Warrior = 3/2
Junk Synchron = 2/1
Spirit Reaper = 0/0*(cannot be destroyed by battle)
Marshmallon = 0/1*(cannot be destroyed by battle)
Sonic Chick = 0/0*(cannot be destroyed by battle against monsters with 3 ATK or more)


Some Extra Deck monsters' summoning requirements might be eased (or become less specific) for the sake of the format (maybe - OR I'll make cards to facilitate easier summoning).


Certain cards will have modified effects in this format:
- Any instance of effect damage, regardless of what the amount should be, will be treated as dealing only 1 LP damage.
^^^ Ex.: Just Desserts vs 3 monsters = only 1 LP damage.
- LP costs for effects will be scaled down, just like ATK+DEF.
- Cards that can destroy/banish/bounce/spin opponent's monsters en masse (board wipers and cards that can hit multiple monsters) will only do so to 1 monster (non-targeted, unless the card states targeting).
^^^Ex: Black Rose's board wipe will destroy only 1 opposing monster without targeting.
^^^Ex: Guardian Sphinx will bounce only 1 opposing monster without targeting.
^^^Ex: Icarus Attack can only target and destroy 1 opposing monster.
- Returning a non-Extra-Deck monster to the Deck will return them to the hand, instead.
- Tributing outside of Tribute[Advance]/Ritual Summoning is treated normally: monster death

- Cards that can destroy/banish/bounce/spin opponent's monsters are limited to 2 per deck.
- All Ignition/Trigger (Monster?) Effects are limited to ONCE PER DUEL BY "[card name]" / Hard-Once-Per-Duel (This does indeed include ones that give you a choice of which effect to use)



-----"GRID DUELS"
In this raid of the castle, when you engage an enemy, you will initiate what I'm tentatively calling a "GRID DUEL."

6-ish x 8 grid:



The top/bottom 4x1 areas = Master Grid Zones
Gray = where the player's (Master's) avatar can choose to stand at the start of the Duel.
The middle 6x6 area = Main Grid Zones
Bright Red/Blue = Summoning Zones


--"Grid Zones" (or just the "Zones")
(monsters can traverse the entire grid board, one space at a time)
(monsters cannot move past an occupied space by going over it; must go around it - unless the occupying monster is dead.)
(Only 1 monster can occupy a space at a time)
--"Main Grid Zones" = the center/middle 6x6 area
(a Master's monsters can only be summoned on the 2 closest rows on their half of the Main Grid Zones)
--"Master Grid Zones" = the 4x1 areas at the ends of the grid board
(the only 4 Grid Zones that a Master can traverse. At the start of the duel the Master picks 1 of the 2 middle squares to start on.)

You can team up with other Masters to take on opponents. Each one can still pick 3 maindeck monsters. Teaming up will (not?) increase the field size slightly (OR just enables more flexibility in Party selection.)

===================

To begin the Grid Duel, you select 3 maindeck monsters and 3 Extra Deck monsters out of your pool of 15 and 5, respectively. The 3 maindeck monsters are called your "(Raid) Party" and start off as cards in your hand. These are essentially the only monsters you can use for that duel - with one exception that I'll explain later ("Reserve Summon"). The remaining maindeck monsters make up your Reserves.
Your Spells and Traps are set up as holograms behind you, treated as public knowledge.

PHASES FOR EACH TURN: Standby>>>Main>>>Battle>>>END
There is NO Draw Phase (no card-drawing)
There is NO Main Phase 2

The Main Phase is where Summoning, Movement, and Spell/Trap usage can be performed. (A Master cannot use Traps until after their first turn has ended.)


GRID SUMMONING
A "Grid Summon" encompasses the following actions:
- Summoning/Setting as many or as few Level 4 or lower monsters as you want in one action - if face-up, can be in Attack or Defense Position
- Tribute[Advance] Summoning/Setting
- Special Summoning a monster from your hand/Deck/Extra Deck
- Ritual/Fusion/Synchro/Xyz/Pendulum/Link Summoning
- A "Reserve Summon" (a Special Summon from the Reserves when a Master has no monsters in hand or alive on the grid. (Once per Duel)
--Flip Summoning a monster does not count; Flip Summon as many as you want (as per usual)
--Maindeck Monsters that are tributed / used as materials for a summon are returned to your hand. They cannot be Grid Summoned/Set until after your 2nd Standby Phase. Extra Deck monsters used this way, instead, cannot be used for the rest of that duel.


MOVING AROUND THE GRID
The Master can move 1 space on their turn, but only to their left or right.
Each of the Master's monsters can move 1 space on their turn, in any direction.


USING SPELL AND TRAP CARDS
Spell Cards can be used during your Main Phase.
Quick-Play Spells can additionally be used at any point during either player's turn where applicable.
Trap Cards can be used like Quick-Play Spells, HOWEVER, a Master can't use them until after their first turn.
When you use a Spell/Trap, the hologram of the card behind you illuminates.
Once you've used the card, the hologram turns to stone and you can no longer use it in the event until you recover its energy.
Spells and Traps are not treated as "on the field" or "in your hand," thus, they cannot be destroyed by card effects. However, they can be negated when used. (This all changes if we allow Equip Spells and/or Continuous Spells/Traps.)


BATTLING
Monsters can only attack in a straight or diagonal line and do not need to be directly adjacent to the attack target.
However, they cannot attack monsters that are behind other monsters. (Can only attack the one in front - unless something lets you attack the one behind.)

Two monsters that can attack the same target have the option of performing a "Unified Attack," combining their ATK to overpower the enemy monster - this uses up both of their attack actions for the turn.

Masters take damage from monster-on-monster attacks, just like in regular duels.

A monster that would be destroyed by battle has its DEF reduced by 1 point instead.
If a monster with 0 DEF is targeted for an attack and is defeated in battle, it DIES. Death is permanent, applying to this and all subsequent Grid Duels - unless you find a way to revive it / have it recover at some point.
In the Grid Duel where the monster died, it remains on the grid, collapsed and grayed out. As such, monsters would then be able to attack through/beyond the dead monster to an attack target behind it.
Defense Position monsters will always trigger Piercing Battle Damage!! (unless they specifically state that they wouldn't take Battle Damage.)

Masters can be targeted for attacks if left wide open!!
REMEMBER: a Master's LP carries over to the Overworld and other Duels, so be careful!



ITEM POP-UPS
Every # rounds, # items will appear on the Main Grid Zones. Where they appears depends on 2 d6s for the X+Y axis(?)
These items are energy orbs, each with a specific positive or negative ability (card effects, healing/draining, movement+/-, etc.)



To win a Grid Duel, either reduce the opposing Master's LP to zero, or ensure their Raid Party is eliminated. When you win a Grid Duel, you can claim some of the opposing Master's energy, allowing you to revive/recover upto 2 of your dead/used-up cards (monsters, spells, and/or traps).

{2.) "The Skeleton Hand Before Christmas" (story idea)}
The storyline is a winter/christmas-themed

A company has a publicly televised Secret Santa gift exchange that they hold every year.
(Everyone knows about it; whether they watch or not is irrelevant)
The gifts are sent to the company in a secure way, checked/screened, and re-boxed in indistinguishable boxes and all opened on live television to show the children being happy, bewildered, confused, and maybe even crying - all for ratings and some good will.
(The amount of gifts that the company is allowed to receive is normally a limited number in the low hundreds [or maybe, on this occasion, it goes up to 1000 with big donors/sponsors/wealthy people getting involved for a PR stunt?]; an age range for the gifts is mentioned beforehand.)

This year, many expensive gifts have been stolen before they got to be re-boxed; show must go on, but PR will be a nightmare.
One of the RP-ers faintly saw someone/people loading a van with stock (spotted an emblem? someone's likeness?).
The RP-er tells someone about it when they realize what happened after hearing a news report or gossip about the theft (tell cops/friends).
They, later, run into that someone again - or someone related. RP-er_______________
EVENT BEGINS
GOALS: Find out where the gifts have been sent, then either send the cops, or save the event yourselves

Targets:
[3] Skeleton Hand Grunts (Clues given: emblem, vague location, team jackets[infiltration])
[2] Skeleton Hand Admins

{3.) Protect the ability user (Supernatural story)}
A girl/guy with a "gift/ability" is being hunted down for unknown reasons.
- defeat the pursuers - have the police deal with them afterward at some point
- guy's/girl's gift/ability causes trouble around you
- find out what exactly it is and why the pursuers are after them; understand its importance(?)
- defeat more pursuers on academy grounds
- find out where their base is
- defeat the Admins and Boss - they have (similar?) abilities that make police involvement useless.

{4.) Life-sapping / vampires? (Supernatural story)}
Someone needs life energy to survive (1 month worth of one's life) every few weeks - can only get it through verbal/physical/mental/emotional consent(??-like a vampire-entering-a-home kind of thing?).
As such, has gone down a more... unsavory life path - uses dueling and attraction("love") as a form of consent. People you know are being affected negatively (long-term major dizziness, and a lack of immediate energy, for a few hours).
---Alternatively, this "someone" could be 3 or 4 different people.
GOALS: Find out what's going on; who's involved; stop them

{5.) "Capture the Flag!" (Game/Event idea)}
CAPTURE THE FLAG (CTF) PvE / PvP
Will use grid and grid-based movement for visual support.
The team that brings the opposing flag to their base X times (or the most within X rounds) wins!
Stand on the ENEMY FLAG SPACE until the end of the round to capture/grab it from the enemy base.
Simply step on your TEAM FLAG SPACE with the enemy flag in hand to score a point; a new enemy flag will then respawn back at the enemy base with a two-turn capture cooldown(?)
If you have the enemy flag, you cannot attack enemy players, but when they attack you, you can still fight back with your own monster.

"Deck/Card Bullets/Magazine" (quantity and ATK ranges can be adjusted if needed)
[3] big ATK monsters (2300-3000) (nothing above 3000 ATK is allowed)
[3] mid-ATK monsters (1600-2300)
[14] low-ATK monsters (0-1700) (monsters with "?" ATK will have 0 ATK)

(Any monster can be used immediately; when used, they are used up)
(ATK is all that matters in these battles. Monster effects will not exist.)
(All monsters are essentially Normal Monsters, including Extra Deck monsters.)
(Cannot use duplicate monsters.)
(Card Bullets reload/refresh after each death -OR- by finding a "Re-Supply" space?)

Player Turn Order is determined via dice roll [2d20?] at the start of EACH round(?)
"Turn" = an individual player's chance for actions during a round. Each player gets 1 turn per round.
"Round" = the encompassing of all players' turns.
Movement: upto 3(?) spaces per turn except during battle; upto 2 spaces while holding flag
Can move>>>battle, battle>>>move, or move>>>battle>>>move if you so wish

Quick Dueling via "Duel Blasters"
(mini arm cannons that shoot weak energy projectiles and a tether)
They project a hologram of the monster card that was inserted into the "drive chamber" when the energy shot connects. After being hit by one, the tether keeps you from running from the attacker. You have to respond with a monster to combat the attacker's own monster. If you fail/refuse to do so, or if your monster loses the battle, you are "killed" and will respawn at your team's base.
If the two monsters' ATK are equal, the tether breaks and the battle is a draw; resume as normal.
Can attack only once per turn.
Can attack opponents only in a straight or diagonal line of upto 3 spaces away.

COMBO SYSTEM
S/T Cards will appear on the battlefield in locations determined by dice at the start of each round.
When collected, you can hang on to them until they're used.
To use them, insert the s/t card with your monster card to apply their effects in the battle.
The order you put the cards in will determine who the s/t card will be applied to:
S/T Card then Monster Card = S/T will apply to opponent
Monster Card then S/T Card = S/T will apply to you

When you are killed, your opponent takes 1 S/T Card of yours, if any, before you're returned to your base.

Types of S/Ts intended for use
- ATK-strengthening/weakening
- long-distance attacks
- land mines
- one-time anti-death armor (cannot be destroyed by this battle + move X spaces away?)
- player boosters (outside of battle) - traversal speed; multi-target attack(?); warp-to-base

{6.) "We Live in a Duel Society" (Standard Story)}
Someone doesn't like:
A.) how Duel Monsters is taking over society; wants to stop it from progressing further.
-OR-
B.) the idea of schools being infected with a Duel Monsters curriculum and wants to shut them down or separate them.
They gained a (cult) following; has their own personal anecdote(s) related to the issue.
How do they begin to make progress?: _________________
The inciting incident that gets the students to fight back?: ________________

((Getting people who are willing to be on the extreme ends to further the conflict in some way will be the hard part to execute this.))

{7.) "People of Interest" (Standard Story - MODIFIED)}
A group of five individuals (anonymous; Team Rocket-esque) - or just one disguised person (stalker? obsessive hoarder? assassin-like?) - target Liberta Academy! They challenge the students as their people of interest and, for reasons unknown, take their valuable cards or belongings after beating them in forced-wager (ante) duels. The police aren't able to apprehend them on their own, so it's up to the students to lend a hand.

{8.) "???????" (Standard Story - MODIFIED)}
A misunderstanding - and/or rumors - about the teachers (or even the headmaster) are going around that's raising tensions among the more opinionated/vocal students. They seem to imply that there may be some sort of suspicious behaviour going on. Nefariousness is sometimes bellowed..., but some can't be reasoned with, and they unfortunately stir up more trouble.

{X.) School VS}
(Academy rivalry)

{X.) DUEL COLOSSEUM}
?????????? (another game mode? - maybe one involving a gauntlet? OR maybe a story)

{EDIT LOG:}
11/27/2021 - Fixed the Grid Duel field layout, with a legend
11/30/2021 - Modified #7 and #8 and #X with ideas from Hydra and Waffles
12/01/2021 - Edited #2 with idea from Hydra
12/07/2021 - Forgot to add a given idea during the 11/30 edit