New gems and enchants
The next expansion brings its own gems and enchants, and a locked character can still use them. The gear is finished; the things you socket and apply to it are not.
Methodology / how the characters get made
I do not choose between playing current endgame and building the next expansion's twink. It is the same character doing both: it solos current content at max level, and when the expansion ends it locks with everything it earned. It arrives in its bracket already finished.
I have worked this way since Dragonflight. Characters from before that were not built like this, so the loop does not describe anything earlier.
The loop
Each pass leaves behind one finished twink and one new max-level main.
Through the seasons of the current expansion, a character takes the highest gear the game is handing out and solos current content with it. This is the part everyone already does — the difference is what happens next.
At the expansion boundary that character stops earning experience. It keeps everything it collected, at a level where nothing in the bracket can compete with what current-season content awarded.
The twink starts complete. There is no gearing phase, no grinding the bracket for upgrades that are worse than what it already has. It is ready to attempt things on the day it is locked, and it keeps that set permanently. The set is what stops here; gems and enchants keep moving.
A fresh character takes over max level for the next expansion, and the loop starts again. Nothing is abandoned and nothing is wasted: last expansion’s main becomes this expansion’s twink.
Why it works
A locked character is judged against the content of its own level, not against the expansion it earned its gear in. Bringing max-level gear down into a bracket is the single largest power difference available, and it is only available in one direction: you can gear first and lock afterwards, never the other way round.
That is why the timing matters more than the grinding. Miss the window and the same character has to earn a far weaker set the slow way, inside the bracket.
After the lock
Locking the level does not freeze everything else. Two things keep moving in the character's favour.
The next expansion brings its own gems and enchants, and a locked character can still use them. The gear is finished; the things you socket and apply to it are not.
Fights get retuned and nerfed over time. That means a character can eventually solo things it could not manage while its own expansion was current — the same character, against a target that moved.
Where it leads
The level 30 to 80 solos are what these characters go on to do once they are locked and finished. The bracket pages list every one.
See the bracket records