This document summarizes the new features and changes introduced in the Mounts of Mayhem update, collecting information from snapshots 25w41a to 1.21.11-pre4.

Big Changes

New Mobs

  • Nautilus:

    • Nautilus
    • A neutral aquatic mob found in all ocean biomes. It can be tamed and ridden, providing the “Breath of the Nautilus” effect to the player, which pauses oxygen consumption.
    • Breeding: Can be bred and tamed using Pufferfish or a Bucket of Pufferfish.
    • Drops: Has a chance to drop Nautilus Shells. The Looting enchantment now correctly increases this drop chance (as of pre-release 1).
    • Misc: Dispensers can now equip Saddles and Nautilus Armor onto a tamed Nautilus.

  • Zombie Nautilus:

    • Zombie Nautilus
    • An undead version of the Nautilus that spawns with a Drowned rider wielding a Trident. It is not hostile unless ridden by a hostile mob and cannot be bred.
    • Drops: The specific drops are not detailed in the source files, but the Looting enchantment now correctly affects its drops (as of pre-release 4).
    • Coral Zombie Nautilus: A rare, colorful variant that spawns in Warm Oceans.
      • Coral Zombie Nautilus

  • Camel Husk:

    • Camel Husk
    • An undead Camel variant that spawns in deserts at light level 0, often with two riders: a Husk with a Spear and a Parched. It does not burn in sunlight and is hostile when ridden.
    • Breeding: Cannot be bred, but its favorite food is Rabbit Foot.
    • Drops: 2-3 Rotten Flesh, with an additional 0-1 per level of the Looting enchantment.

  • Parched:

    • The Parched
    • A new Skeleton variant that spawns in deserts at light level 0. It does not burn in sunlight.
    • Behavior: It shoots Arrows of Weakness, has a slower rate of fire than a regular Skeleton, and is immune to the Weakness effect.
    • Drops: Drops Bones, Arrows and Arrow of Weakness (Player kill only)

  • Zombie Horse:

    • Zombie Horse
    • Now spawns naturally in plains and savannas with a Zombie rider holding an iron spear. It burns in sunlight but can be protected with Horse Armor. It can be tamed, saddled, and ridden, but not bred.
    • Taming: Can be healed and tempted using Red Mushrooms.
    • Drops: 2-3 Rotten Flesh (plus 0-1 per Looting level). The Zombie rider has a chance to drop a Red Mushroom.

New Items & Equipment

  • Spear:

    • A new weapon with a longer reach than swords. It can be crafted from various materials (Wood, Stone, Copper, Iron, Gold, Diamond, and Netherite).
    • Attacks: It has a quick “Jab” and a powerful “Charge” attack. The Charge attack’s damage increases with velocity.
    • Damage: See https://minecraft.wiki/w/Spear#Usage for detailed Damage overview + calculator
    • Images of Spears:
      • Wooden Spear
      • Stone Spear
      • Iron Spear
      • Golden Spear
      • Diamond Spear
      • Netherite Spear
    • Enchantments: All sword enchantments + Lunge

  • Lunge Enchantment:

    • A Spear-exclusive enchantment that propels the player forward during a Jab attack. Level 1-3
    • Cost: Consumes 1, 2, or 3 hunger points (depending on the level) and 1 durability point per use. It requires the player to have at least 6 hunger points.
    • Acquisition: Enchanting, Trading or Fishing.

  • Nautilus Armor:

    • Armor for the Nautilus and Zombie Nautilus, available in Copper, Iron, Gold, Diamond, and Netherite. It can be found in Buried Treasure, Ocean Ruins, and Shipwreck chests.
    • Images of Nautilus Armor:
      • Copper Nautilus Armor
      • Iron Nautilus Armor
      • Golden Nautilus Armor
      • Diamond Nautilus Armor
      • Netherite Nautilus Armor

  • Netherite Horse Armor:

    • Netherite Horse Armor
    • Can be crafted by upgrading Diamond Horse Armor at a Smithing Table.

Smaller Changes

Gameplay

  • Mounts in Water: Horses, Donkeys, Mules, and Camels no longer sink when ridden in water.
  • Mob Behavior:
    • Tamed horses no longer run into cacti or sweet berry bushes.
    • Mounts controlled by mobs will not panic.
    • Piglins now favor Golden Spears.
    • Zombified Piglins can now charge with Spears.
    • Skeleton variants and Drowned can no longer pick up Spears.
  • Advancements:
    • New “Mob Kabob” advancement for spearing multiple enemies.
      • “Hit five mobs in the same Charge attack using the Spear.”
    • Existing advancements updated to include new mobs and items.

World & Environment

  • Underwater Fog: The fog color and distance in underwater biomes now blend smoothly between biomes.
  • Nether Fog: Environmental fog in the Nether is now consistent and not dependent on render distance. nether_fog.png
  • Weather Effects: The sky color during sunrise and sunset is now affected by rain and thunder.
  • Halloween Bats: Bats no longer have increased spawn rates during Halloween.

Graphics & UI

  • New Debug renderer for showing a Light Level Overlay in F3 Menu can be enabled light_overlay.png
  • Chunk Fading: Chunks now fade in smoothly instead of appearing suddenly. (Fade-In Time is a new option)
  • Video Settings:
    • Graphics presets (“Fast”, “Fancy”, “Fabulous!”) replace the old graphics modes.
    • “Texture Filtering” option added to control Anisotropic and RGSS filtering.texture_filtering.png
    • “See-Through Leaves” is now off by default on the “Fast” preset and provides a greater performance boost. When disabled, leaf gaps are dark green instead of black.
    • Items will no longer “bob” whenever their durability changes, such as when losing durability from an attack, or repaired by Mending mending_item
  • UI Improvements:
    • Search boxes added to the Single Biome and Language selection screens.
    • Spawn Eggs are now thematically sorted in the Creative Inventory.
    • An inventory UI has been added for the Nautilus.
    • The “Music Toast” option now has three states.

Other Changes

  • Data & Resource Packs:
    • Game rules were renamed to use a snake_case format (e.g., doDaylightCycle is now advance_time).
    • Environment Attributes: A new data-driven system to control visual and gameplay effects like sky color, fog, and mob behavior.
    • Timelines: An experimental feature to modify game behavior based on the in-game time of day.
    • The attack_range item component was added to customize weapon reach.
  • Commands: The stopwatch command was added to track real-time, and the worldborder command now accepts time in ticks, seconds, or days.

Important Bugfixes

  • MC-2791 - Player model in the inventory screen renders in the wrong orientation.
  • MC-73186 - Gaps appear between faces of item and complex block models.
  • MC-114265 - Mipmaps are too dark around transparent edges.
  • MC-149630 - Particles have thin, vertical lines flashing around them.
  • MC-154651 - Boats and rafts can break paintings and item frames.
  • MC-238715 - The minecraft:block.chest.locked sound is not audible to other players.