Diablo 4's Hellfire Torch is much easier to farm with a four-player rotation
You can take turns opening Echo of Tristram, giving everyone multiple chances at the Torch.
If you have finally collected the three Prime Evil Splinters needed to craft 
Wirt's Lucky Coins in Diablo 4, you probably do not want to waste it on a single Echo of Tristram run. Fortunately, you can get much more value from your coins by joining a four-player group and taking turns opening the portal.
The rotation is pretty simple. Each player brings their own Coin, and you can fight Diablo, Baal, and Mephisto four times in a row.
You have to make sure everyone stays for every run, and you should get more than one 
Hellfire Torch from it. You also get all the other rewards without having to farm 4 coins yourself.
How Does the Rotation Work
It is a pretty simple rotation to do. At the start of the season, Blizzard had "nerfed" that by putting a one-hour cooldown that would prevent you from farming the encounter multiple times in a row. However, this cooldown has long since been removed, and you can again group up and rotate coins.
So, here is what you need to do:
Find 3 other players you can group up with
You can do so through the party finder, or simply by teleporting to Tristram. Near the fountain, you can often find other players looking for a group.
Make sure everyone has a
Wirt's Lucky Coins and is ready to stay for 4 runs
All 4 players need to be ready for the fight, or you need at least one person who can carry
This is not an easy fight, and if you use a coin and cannot clear it, you will have lost your
Wirt's Lucky Coins
Coordinate on who uses their coin first. It can bug out if two players interact with the fountain at the same time
Make sure everyone is already in Tristram near the fountain
Once you know in which order you do it, let the first person use their
Wirt's Lucky CoinsThe entire group enters the portal that just opened
Clear the fight, get your rewards, get back out
Party Leader needs to reset Dungeons using the "Reset Dungeons" option on the map
Make sure you do this between each run, before the next person uses their coin, because otherwise it can consume it without opening a new portal
Let the 2nd player use their coin, and repeat until everyone has used theirs
You now completed 4 Prime Evil runs, you should have more than one Hellfire Torch, and a ton of other rewards!
This gives everyone four encounters from essentially only one of your own coins, instead of one encounter per person. If you do it solo, you would have to farm for 4 coins for the same amount of rewards.
You also do not need to trade your coins or hand them to the party leader. Each player can just use their own coin when it is their turn.
Do not join an encounter that is already running. You can if your goal is simply to help someone complete the fight, but joining an already started encounter prevents you from getting any rewards.
The important distinction is that every rotation needs a new coin and a newly opened portal. Simply resetting an existing instance or joining someone else's already-open portal is not the same thing.
So, if you are joining a group, make sure the person opening it uses their coin in front of everyone. We would recommend asking members to link their coins in party chat beforehand.
It is a reasonable precaution when each run costs multiple hours of farming.
Is Selling Your Run Worth It?
You might also come across players offering to pay for a spot in their Echo of Tristram run. This can be an alternative if you have a coin but do not want to organise a full rotation yourself, or if you are pretty much done with the season and you want to carry some lower level players through it so they can get a Hellfire Torch
However, there are a few rules when it comes to that.
First, you have to only accept in-game gold. Do NOT accept random real-life transactions, as these could come from illegal sources and cause you a lot of problems.
And second, make sure you check the "market rates" for the price so you are not underselling your own services.
Personally, we would stick with a four-player rotation if you can find three other players you trust. Everyone contributes one coin, everyone gets four encounters, and nobody has to pay billions of gold for the privilege.
It is the best way to farm for Hellfire Torch if you are still looking for that perfect stat roll.
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