Minecraft 1.21.11 Snapshot 25w45a adds Netherite Horse Armor and a new Coral Zombie Nautilus mob in warm oceans. It brings a new Mob Kabob advancement and several spear improvements for better combat. A new Timeline system lets worlds change visuals and behavior over time, like sky colors or mob activity. It also updates pack formats, textures, and fixes many bugs for smoother gameplay.

Features:

Additions

  • Mobs
    • Coral Zombie Nautilus — new zombie nautilus variant that spawns in warm oceans (replaces the normal zombie nautilus there).
  • Items
    • Netherite Horse Armor — obtainable by upgrading Diamond Horse Armor at a smithing table using a Netherite Ingot and the Netherite Upgrade template. (Stats: +19 Armor, +3 Armor Toughness, +1 Knockback Resistance.)

Gameplay

  • New advancement: Mob Kabob — hit five mobs in the same Charge attack using the Spear. (Armor stands and mannequins count.)
  • Spear updates: margin hitbox reduced from 0.25 to 0.125; new advancement trigger spear_mobs (supports player predicate and count).

Environment attributes

New data-driven environment attributes control visual and gameplay parameters. Key examples:

  • Visual attributes — sunrise/sunset color, sun/moon/star angles, moon phase, star brightness, sky light color and factor. (Applied when skybox = overworld.)
  • Gameplay attributes — sky light level (affects spawning/daylight detectors), turtle egg hatch chance, cat morning gift chance, bees staying behavior, monsters burning under sky exposure, pillager patrol spawning control, villager default activities, and more.
  • Audio attribute — firefly bush idle sounds (boolean).

Timelines

Timelines are a new data pack concept (registry: data//timeline/.json) that:

  • Define behavior over absolute day time (/time set), optionally repeating via period_ticks.
  • Act as an Environment Attribute source and can modify visuals/behavior using keyframed tracks with easing types (linear, constant, various in/out easing, or cubic Bézier).
  • Are included by dimensions to become active; priority order for attribute sources: Dimensions → Biomes → Timelines → Weather.

Example (periodic track snippet):

{ "period_ticks": 24000, "tracks": { "minecraft:gameplay/cat_waking_up_gift_chance": { "ease": "constant", "modifier": "maximum", "keyframes": [{ "ticks": 362, "value": 0.0 }, { "ticks": 23667, "value": 0.7 }] } } }

Data / Resource pack / Format changes

  • Pack format: data pack format → 93.0.
  • Resource pack version: 73.0.
  • Texture atlas: item textures moved to a separate items atlas (no mipmaps). All textures used by an item model must come from the items atlas; block models must use the blocks atlas.
  • Data component bounds: minecraft:piercing_weapon and minecraft:kinetic_weapon reach parameters now constrained (min/max reach 0.0–128.0; hitbox_margin 0.0–1.0).
  • Dimension types: new optional timelines field; effects replaced by skybox and cardinal_light; fixed_time replaced by has_fixed_time.

Tags

  • Added biome tag #spawns_coral_variant_zombie_nautilus.
  • Added timeline tags: #universal, #in_overworld, #in_nether, #in_end.
  • Removed #without_patrol_spawns; replaced by gameplay attribute can_pillager_patrol_spawn.

Changes

  • Mob drops: Camel Husk now drops 2–3 rotten flesh (plus 0–1 per Looting level).
  • Persistence: Zombie horses, camel husks, and nautiluses become persistent after any player interaction (not just riding).
  • Game rules: maxEntityCramming minimum changed to 0.

Fixes

45 issues fixed. Notable fixes include (selected):

  • Entity animations stopping after long existence (MC-199467).
  • View bobbing stopping after long elytra flight (MC-245895).
  • Inventory item and texture mipmap issues causing blurriness (MC-303108, MC-302659, MC-303658).
  • Spear-related bugs: dismounting inanimate passengers, charging animation mirror, attacking through doors, charging while dying, and other spear edge cases (multiple MC-30xxxx entries).
  • Untamed zombie horses/nautiluses and camel husks despawning in certain conditions fixed (several MC-3036xx entries).
  • Misc UI and performance fixes: cloud jitter with large gametime, chunk fade/visibility, hover events in GUIs, text clipping, statistics saving, and more.

Screenshots:

Requires:

Java 21+

Java Runtime Environment

How to install:

Minecraft 1.21.11 Snapshot 25w45a Download Links

Client: Download from Server 1

Server: Download from Server 1

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