Everything Added in Minecraft 1.21

Minecraft 1.21, "Tricky Trials", released on 13 June 2024, and nearly all of it hangs off one structure. Find a trial chamber and you get the fights, the keys, the vaults, the mob whose drops feed everything else, and the only weapon in the game that turns fall distance into damage. Outside the chamber, 1.21 added one redstone block that finally automates crafting, and two complete families of building blocks. Here is the whole list with the numbers that matter — and a section at the end on the features people wrongly file under 1.21.

Trial chambers: where they are and what they are made of

Trial chambers are underground copper-and-tuff complexes built from tuff bricks, polished tuff, chiseled tuff and copper blocks in every oxidation stage, with copper doors between corridors.

• The starting room generates between Y=-40 and Y=-20, and most of the rooms sit between Y=-20 and Y=0. That is well above the band you actually mine for diamonds — deepslate diamond ore peaks at Y=-58 to Y=-59 — so a normal strip mine will never wander into one. Watch instead for cave openings with unnaturally straight walls, or buy the map.
• They generate in any Overworld biome except the deep dark. Precisely, the structure's origin piece cannot land in a deep dark biome, though outlying rooms may intersect one.
• One chamber generates per 34x34 chunk region, at a random spot inside it, unless a deep dark biome cancels that region.
• They only generate in chunks created after 1.21. An old world will never grow one under your existing base — you have to travel out to fresh terrain.
• A journeyman cartographer sells a trial explorer map for 12 emeralds and a compass. In Java the target is locked in when the trade unlocks, so every map you buy from the same villager points at the same chamber — buy from a different cartographer if you want a second one.

Inside, corridors run on lower, middle and upper levels, tied together by grand staircases and ladders. Loot sits in chests, barrels, decorated pots and dispensers, and the dispensers are frequently pointed at you. The full room-by-room breakdown is in trial chambers explained.

The trial spawner

The trial spawner is the block the whole structure is built around. It is not a normal monster spawner: it activates when you walk into range, spawns a fixed wave, and stops when the wave is dead. It ignores light level entirely, only places mobs in its own line of sight, and the mobs it spawns are persistent — they never despawn.

It scales with the number of players nearby. Solo, you fight 6 mobs total with 2 alive at a time. Every extra player adds 1 to the simultaneous count and 2 to the total, so a group of three faces 10 mobs with 4 out at once. That challenge level only resets during the spawner's cooldown, so a friend who wanders off mid-fight does not make it easier.

The mob pool is zombies, baby zombies, husks, skeletons, strays, bogged, spiders, cave spiders, slimes, silverfish and breezes. Each spawner room draws from one type, which is why a chamber has a distinct breeze room, a distinct spider room, a distinct slime room, and so on.

Clear the wave and the spawner waits 2 seconds, then ejects one item every 1.5 seconds, once per detected player. Each ejection is a coin flip, not a guaranteed key:

• 50% a trial key, which drops once for every player present.
• 50% a consumable, dropped individually to each player — bread, cooked chicken, baked potatoes, or a potion of Regeneration or Swiftness.

Then it goes on a 30 minute cooldown, and that timer keeps running even while the chunk is unloaded.

Ominous mode: bottles, Bad Omen and Trial Omen

1.21 rewrote how Bad Omen works. Killing a raid captain no longer applies the effect directly. A captain killed outside a raid drops an ominous bottle instead, and you choose when to drink it — which means you can carry the trouble to where you want it. Bottles also turn up in vault loot (about 16% of normal vault openings, in strengths I and II), so you can start the chain without ever leaving the chamber. Drinking one gives Bad Omen for 100 minutes, at one of five levels depending on the bottle.

Once Bad Omen is running:

• Walk into a village and it converts to Raid Omen, a 30 second fuse. When it expires the raid starts at the spot where you picked it up — drink milk inside those 30 seconds and you cancel it.
• Come within detection range of a trial spawner that is not already ominous and it converts to Trial Omen instead, lasting 15 minutes per level of the Bad Omen you drank. Trial Omen turns nearby trial spawners and vaults ominous. A spawner sitting on cooldown skips the remainder of that cooldown when it converts, provided it was not ominous on its previous run — and converting despawns any mobs it had already spawned.

Ominous trials throw longer waves at you, and the mobs arrive kitted out: armour and weapons carrying enchantments from a fixed pool (Protection IV, Projectile Protection IV, Fire Protection IV, Sharpness I, Knockback I, Power I, Punch I) with trial chamber armour trims applied. The spawner also rains lingering potions and projectiles into the arena mid-fight, and picks a player rather than a mob as the target 50% of the time.

The four new status effects all arrived with this system, as potions and as tipped arrows:

• Oozing — the victim spawns two slimes when it dies.
• Weaving — the victim leaves 2 to 3 cobwebs when it dies, and anything carrying the effect moves through cobwebs at full speed (players at 50% instead of the usual 25%).
• Wind Charged — the victim releases a wind burst when it dies.
• Infested — a 10% chance, every time the victim is hurt, to spawn 1 to 2 silverfish.

Completing an ominous trial spawner gives ominous trial keys instead of ordinary ones, on a 30% chance per ejection in place of the normal 50% trial key roll.

Vaults and trial keys

A vault is a locked container. Stand within about 3 blocks — the keyhole visibly opens, with an orange particle stream running from you to the vault — use a trial key on it, and it ejects loot.

The important rule is that each player can open a given vault exactly once. The vault remembers up to 128 players and forgets the oldest beyond that, so a group of four clears four times the loot from the same chamber in one trip. Solo, one vault is one payout, forever.

Normal vaults hold emeralds, iron ingots, arrows, wind charges, honey bottles, diamonds, ominous bottles, enchanted diamond gear, enchanted books, the Bolt armour trim template and the Precipice music disc. Ominous vaults are where the real prizes live: a 7.5% chance of a heavy core, a 5.5% chance of a Wind Burst book, plus the Flow armour trim at 22.5%, enchanted golden apples at 22.5% and the Creator music disc at 7.5%. The heavy core and the Wind Burst book exist nowhere else in the game.

The Breeze and wind charges

The Breeze is a wind elemental that only comes out of trial spawners — specifically the ones ringed with chiseled tuff. It has 30 health, it never stops hopping (up to 15 blocks horizontally and 5 vertically), it takes no fall damage, and it deflects every projectile except wind charges, so arrows are worthless against it. Its own shots do almost no damage — 1 on Easy and Normal, 1.5 on Hard — because the push is the weapon: it exists to drag you off your cover and into the room. Kill it for 1 to 2 breeze rods, up to 4 to 8 with Looting III.

One breeze rod crafts into four wind charges, and those are one of the most useful throwables in the game despite dealing 1 damage on a direct hit:

• The burst knocks entities back about 2.5 blocks, with a 0.5 second cooldown between throws. A charge you threw yourself pushes about 22% harder than one fired by a breeze.
• It opens and closes non-iron doors, trapdoors and fence gates, presses buttons, flips levers and rings bells from across a room.
• It extinguishes lit candles, and it breaks decorated pots, chorus flowers and pointed dripstone — so watch where you throw one inside a chamber full of loot pots.
• It does not damage you when you throw it. Launch yourself off one and you only start accumulating fall damage once you drop back below the Y level where the burst hit. Thrown straight down at your own feet it lifts you roughly 6 blocks, against about 2.5 from a sideways hit.

That last line is why wind charges pair with the mace, and it is covered properly in the Breeze and wind charges.

The mace and the heavy core

The mace is crafted from one heavy core and one breeze rod. Since the heavy core is a 7.5% roll from ominous vaults only, owning one means running the whole ominous chain repeatedly.

Base stats are deliberately unimpressive: 6 attack damage, 0.6 attack speed (one swing every 1.667 seconds) and 500 durability. That is the same damage as an iron sword delivered at well under half the sword's 1.6 swing rate, so on flat ground the mace is the worse weapon by a wide margin. The damage comes from height:

• 4 bonus damage per block for the first 3 blocks of fall
• 2 per block for the next 5 blocks
• 1 per block beyond that

Drop 10 blocks onto a mob and that is 12 + 10 + 2 = 24 bonus on top of the base 6, so 30 damage — fifteen hearts — in one swing. The smash triggers from 1.5 blocks of fall, knocks back everything within 2.5 blocks of the impact (harder still past 5 blocks fallen), and cancels all of your accumulated fall damage when it connects, killing your vertical momentum with it. Miss, and you take every point of it yourself.

Repair it in an anvil with breeze rods, 25% durability each. Its three exclusive enchantments are Density (more damage per block fallen, max V), Breach (ignores part of the target's armour, max IV) and Wind Burst (relaunches you upward on a successful smash, max III). Wind Burst books only drop from ominous vaults and only at level I, so reaching III means combining four of them. Full tiers and combos in the mace guide.

The Crafter

The Crafter is the standout non-combat addition: 5 iron ingots, 1 crafting table, 2 redstone dust and 1 dropper. Lay it out as three iron across the top row, iron either side of the crafting table in the middle row, and redstone, dropper, redstone along the bottom. It holds a 3x3 grid, and one redstone pulse crafts one item after a 4 tick delay, firing the result into whatever container it faces.

Two behaviours make it work where a dispenser would not. You can click empty slots to disable them, which locks the recipe shape so hoppers and droppers can never push items into the wrong square. And it crafts on the rising edge of a signal — flip a lever on and you get exactly one craft, and holding it there produces nothing further, so every automatic build needs a pulse source. Note also that in Java the Crafter ignores quasi-connectivity, unlike droppers and dispensers, so old QC-based trigger tricks will not fire it. A comparator reads it as one signal strength per slot that is filled or disabled, 0 to 9. See the Crafter block guide for the wiring.

The bogged

The bogged is a mossy, mushroom-covered skeleton with 16 health instead of a skeleton's 20, and it shoots tipped arrows of Poison lasting 4 seconds.

• It spawns naturally in swamps and mangrove swamps, replacing roughly 30% of skeleton spawns there, and from trial spawners in chambers.
• It fires more slowly than a skeleton — about 3.5 seconds between shots on Easy and Normal — so a shield shuts it down completely.
• It drops bones and arrows, has a 50% chance to drop an arrow of Poison, and shearing one drops 2 mushrooms (red, brown, or one of each). That is a renewable mushroom source with no mushroom island required.
• It takes freezing damage from powder snow and, unlike a skeleton, never converts into a stray.

Poison cannot kill you outright, only drop you to half a heart, but stacked with a breeze knocking you into a spider room it absolutely will.

Copper and tuff

1.21 turned two half-finished materials into full building palettes.

Copper additions: chiseled copper, copper grate, copper door, copper trapdoor and copper bulb — each in unoxidised, exposed, weathered and oxidised states, and each of those waxable with honeycomb. Copper doors and trapdoors open by hand at every oxidation stage.

Tuff additions: tuff stairs, slab and wall; polished tuff with its own stairs, slab and wall; tuff bricks with stairs, slab and wall; plus chiseled tuff and chiseled tuff bricks. The stairs, slabs and walls can all be cut straight from tuff on a stonecutter, which is the cheaper route for stairs — 6 tuff for 4 stairs in a crafting grid, 1 tuff for 1 on the cutter. Tuff finally became a grey palette you can build a whole structure from, and it sits under copper better than deepslate does. If you want to see the pairing used at scale, most of the build tutorials let you rotate the model and step through it layer by layer.

The copper bulb is the mechanically interesting one. Craft it in a plus shape: copper block top, copper block left and right of a blaze rod, redstone dust below — three copper blocks in total, four bulbs per craft. It emits light 15 unoxidised, 12 exposed, 8 weathered, 4 oxidised, so wax it at the brightness you want.

Smaller 1.21 additions

• Bolt and Flow armour trim smithing templates — Bolt from standard vaults, Flow from ominous ones
• Flow, Guster and Scrape pottery sherds
• Flow and Guster banner patterns
• Three music discs: Precipice from standard vaults, Creator from ominous vaults, and Creator (Music Box) from decorated pots broken inside trial chambers
• 20 new paintings by Sarah Boeving and Kristoffer Zetterstrand
• Potions, splash potions, lingering potions and tipped arrows for all four new effects, plus ominous bottles in five strengths
• Eight new advancements, including Over-Overkill, Revaulting and Crafters Crafting Crafters
• The trial explorer map, and spawn eggs for the bogged and Breeze

What is not in 1.21

This trips people up constantly, because these shipped weeks apart.

Armadillos, wolf armour and the eight new wolf variants are 1.20.5, the Armored Paws drop from 23 April 2024 — not Tricky Trials. Armadillos live in savanna and badlands, breed with spider eyes and give scutes both periodically and when brushed; six scutes make dyeable wolf armour that shears off cleanly and repairs with more scutes. That is all covered in wolf armour and pets.

Also not Tricky Trials, despite the shared 1.21 version number: bundles (1.21.2, 22 October 2024), the pale garden and the creaking (1.21.4, 3 December 2024) and the happy ghast (1.21.6, 17 June 2025). Those are later point releases with their own drops.

And nothing in 1.21 retrofits itself into old terrain. Trial chambers, and therefore maces, heavy cores, breeze rods and wind charges, all require chunks generated after the update. If your survival world predates it, pick a direction and ride out a few thousand blocks before you conclude the update is broken.