The "End of the World" is a deck of Ruin & Demise that Nightshroud uses to destroy everything.
While this archetype has many supportive cards, they are not very suitable. That's why we have to use the Impcantation's engine to search and recycle resources. Impcantation cards are very difficult to manage and play effectively, cause they unlock so many options and you can make bad decisions.
1)One of the most difficult things is to find the right values of copies per card when you are building the deck.
2)The second is to execute the complicated combos.
3)The third is that these cards have hard limitations and you can't use your Extra Deck, while the Ritual spell of this archetype can only tribute Impcantation monsters.
So there is added even more mechanics and limitations by inserting another archetype as "Ruin & Demise". I am not gonna talk a lot about everything this archetype is doing but I will give you only the important tips you might need.
What this deck lacks is space. Cause I had many more ideas like using "Seal of Orichalcos" and "United we stand" to increase the attack points of all monsters on field even further with the help of "Crealtar, the Impcantation Originator".
"Renewal of the World" is a very good card too that you can skip Ritual spells and even search for your Ritual monster, so the only thing you need to ritual summon is this trap and a monster for tribute.
"Preparation of Rites" is another good card to search for the level 7 Impcantation that it can do an one card combo, but as I said there is no free space and I don't feel like I should exceed the deck size from 40 to something bigger.
"Pre-Preparation of Rites" is a good one too, as you can search for both a Ritual spell and Demise (the level 8 variant), which feels like an even better Pot of greed for this deck. The most important level 10 Ritual monster is Ruin and not Demise at all, as you can read from their effects.
I am using a lot of stun cards to slow down the game, cause every combo needs a lot of cards to waste. I think that the most you play this deck the more you understand how to use it. Cause you will face many of it's weaknesses and maybe learn about more efficient combos as you progress.
In my opinion this deck can make you an even better player and you have to try it if you want to achieve that. If you just wanna chill and play a nice deck, then stay away from this overcomplicated mess. So let's talk again about some things you need to have in mind.
a) Impcantation's ritual spell can only use as tribute impcantation monsters.
b) Ruin & Demise should be ritual summoned with a level 10 ritual monster as tribute, to unlock their true potential.
c) Impcantation monster's effects can only be used once per turn, keep that in mind.
d) If you can't make a Ruin & Demise combo, you can always run the Impcantation Engine and win by that.
e) All the cards in extra deck are placeholders, so add whatever is available, you don't really need XYZs or Links to play.
There are always other approaches of this deck, like running the Megalith Engine which is something that might be better, or even run a pure version of Ruin & Demise. I hope you liked this deck, this is one of my favorites!