Fourth Night

Every fourth night, something is wrong with the dark.

The mobs don't wander anymore. They come straight for you. up walls, or through them if that's faster. You've got until sunrise.

BloodMoon turns the vanilla monsters into a coordinated horde on a schedule. The worst night your base has ever had, every four days.

It comes in two builds: a Paper plugin for servers and a Fabric mod for singleplayer or Fabric servers. They play identically.

How the night works

A blood moon rises every 4th night and runs for about 10 real minutes. When the sun finally comes up, every monster left standing dissapears into red dust, and you get some breathing room until the next one.

Daytime is safe. Every dawn clears out the hostile mobs, blood moon or not, so the game is really about surviving the nights.

What the mobs actually do

During a blood moon the horde ignores the normal mob pathfinding and runs its own 3D navigation over the real blocks in the world. That means the tricks that keep you safe in vanilla just don't:

Your plan	How that goes
Pillar up a few blocks	They climb the pillar. Skeletons shoot you off it.
Wall yourself in	Zombies dig through the wall. It takes them a bit, but they'll get in.
Build a moat	They swim.
Nothing in reach at all	They pillar up and bridge across to you with blocks.

A few more things worth knowing before your first one:

• They share what they see. The moment any mob gets eyes on you, the whole horde has your position. They see you through walls within 64 blocks, at any height. Getting far away is the only thing that actually breaks their lock.
• Creepers sense you through walls and will just blow a hole in one to get in.
• Everything they break, blow up, or build gets put back at dawn, so your base heals even if it got wrecked. (If you turn it on in the config)

Loot

Killing the horde is worth it. Every kill drops extra XP, and about a third of them drop a piece of enchanted iron or diamond gear. swords, axes, pickaxes, shovels, full armor, or bows, with enchantments. Survive the whole night and you get a chunk of XP and some regen on top.

One more thing

While a blood moon is up, don't hit the animals. Punch a sheep and it hits back, and so does the rest of the flock, and they're faster than you'd expect. Villagers too. Tamed pets and named mobs are left alone. Outside of a blood moon the animals are completely normal, so this only bites you on the bad nights.

Commands

• /bloodmoon status — what day it is and when the next moon lands
• /bloodmoon start — force one right now (jumps to night if it's daytime)
• /bloodmoon stop — end the current one

The Paper plugin also has /bloodmoon next, /bloodmoon test (drops a hunting party on you mid-moon), and /bloodmoon reload.

Config

The Paper plugin generates plugins/BloodMoon/config.yml with knobs for basically everything: how often the moon comes and how long it lasts, mob caps and the mix of mob types, how much damage they mine through and the nightly block budget, creeper breach odds, climbing and ceiling behaviour, the through-wall sense range, loot chances, the ambience effects, and the animal retaliation. Change what you want and run /bloodmoon reload.

Installing

Paper: drop the plugin jar in your server's plugins/ folder and restart. Needs Paper 26.2.

Fabric: drop the mod jar in mods/. Needs Fabric Loader 0.19.3 or newer and Fabric API. Works in singleplayer and on Fabric servers.

Both need Minecraft 26.2 and Java 25. BloodMoon runs on the server side, so on a server nobody has to install anything on their client.

Notes

• Only normal overworld-type worlds get blood moons.
• Named mobs and tamed pets are never purged or turned against you.

if you wanna see me die to the mod, click that

Good luck out there. muahaha