Do Gamebreaking Damage In Timewalking Mode (Patreon)
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Until recently there was a powerful working method on this patreon to one-shot anything in time-walking mode. Due to some high-profile well-publicized gold farming activities by a specific operation this method was fixed* by Blizzard in patch 10.1.5.
Here is an alternative method. Group up a max level character with a free starter edition account character you own that is in any chromie timewalking mode (you can also use a paid account or get a friend to help if you prefer). Go into party sync. Attack any mob with a damage over time effect or preferably, effects. Leave party sync. You should aim to leave at the exact second the damage over time effect attacks.
With luck your combat logs will record a very large amount of damage and you may see a death animation for a fraction of a second. You are now back in non-sync mode so re-enter party sync to loot the mob you just killed.
Getting the timing right can be tricky-expect this to fail multiple times before you get the hang of it.
When this works it is very lucrative as you essentially can one-shot world bosses. You have a monopoly on these bosses since they are normally impossible to kill solo in time-walking mode and any items they may drop.
I am working on alternative methods and improvements to this technique and may update this article.
* Most patreons will know this but it can't hurt to repeat that discretion with a play this strong is advisable.