go ominous for tougher loot ominous keys open better vaults
A trial spawner wakes when you get close, throws waves of mobs at you, then ejects loot and goes on a long cooldown. Drink an ominous bottle first and it spawns harder fights for far better rewards.
What you need
A trial spawner, in a chamber
Good gear to clear the waves
An ominous bottle for harder loot
Keys to open the vaults
Fight the waves, take the loot
A trial spawner sleeps until you get near, then throws waves of mobs at you and ejects loot once you clear them, before a long cooldown. You cannot move it, so you farm it in place. Drink an ominous bottle first and it turns ominous: harder fights, ominous vaults, and the keys and heavy cores you want for a mace.
Quick answers
What is a trial spawner farm in Minecraft?
It is a way to get repeated loot and experience from the trial spawners in a trial chamber. You cannot pick a trial spawner up, so you farm it in place: clear its waves, grab the loot, then either move to another spawner in the chamber or wait out its cooldown before fighting it again.
How does a trial spawner work?
It stays dormant until a player gets close, then it lights up and spawns waves of mobs that scale with how many players are nearby. Clear every wave and it ejects loot, then goes on a long cooldown of around 30 minutes before it can be activated again.
What does going ominous do?
Drink an ominous bottle, or carry the Bad Omen effect, before you trigger the spawner and it turns into an ominous trial spawner. The waves get tougher, it spawns ominous vaults, and it drops ominous trial keys plus much better loot, including the heavy core used to make the mace.
How do you farm them efficiently?
Find a trial chamber, gear up with armour, a strong weapon and food, then clear and loot each spawner and its vaults one after another. Because cooldowns are long, the fastest farming is cycling through the chamber's many spawners rather than waiting on a single one.
Can you move or silk-touch a trial spawner?
No. Like a normal monster spawner it cannot be picked up, silk-touched or relocated, so there is no way to build a portable one. You always farm it where it sits inside the trial chamber.
Do trial spawners work the same on Bedrock?
Yes. Trial chambers, trial spawners, ominous bottles and ominous vaults all arrived in the 1.21 update on both Java and Bedrock, so the farming loop is the same across editions.
A trial spawner produces a set number of mobs, then goes on a long cooldown that you cannot shorten. That makes it fundamentally different from a dungeon spawner: the farm's rate is set by the game, not by your design.
The reward comes from the vault, not the mobs
Ominous trial keys open vaults for the loot, and the loot is the reason to run a chamber at all. A farm that only kills the mobs and never opens a vault is doing the dangerous part and skipping the payoff.
Player proximity starts it
Trial spawners only activate when a player is near, and they scale with how many players are there. An unattended farm therefore does nothing, which limits how automatic this can ever be compared with a normal mob farm.