HomeMinecraft ModsRelentless Undead Siege Mod (1.20.1) – Defend Your Base From Smart Zombie

Relentless Undead Siege Mod (1.20.1) – Defend Your Base From Smart Zombie

August 27, 2026

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Relentless Undead Siege Mod transforms ordinary zombies into intelligent hunters that actively break into your base. The mod boosts zombie spawn rates and gives them the ability to hear footsteps from far away. Undead mobs can now dig tunnels, climb ladders, build bridges, and smash weak blocks to reach you. Nighttime becomes a true fight for survival as stronger undead types and red Blood Moon events test your defenses.

Features:

Makes zombies take up roughly 70% of all hostile mob spawns in your world.
Allows zombies to spot players from up to 100 blocks away and track sound from 50 blocks out.
Gives zombies the ability to break weak blocks like wood, doors, stone, dirt, sand, and gravel.
Lets zombies place blocks below themselves to climb walls and build bridges across gaps.
Enables zombies to climb ladders, break open chests, and dig tunnels through solid terrain.
Allows zombies to walk across water without drowning or turning into drowned mobs.
Gives regular zombies a small chance to spawn wearing armor or holding weapons.
Introduces 12 unique elite zombie classes equipped with special combat skills.
Triggers Blood Moon events every 7 to 15 days with four times more zombie spawns.

Elite Zombie Types:

Scout and Fast: quick runners that chase players down across open fields.
Tank and Juggernaut: heavily armored monsters that absorb large amounts of damage.
Trapper: sets dangerous traps including TNT, cobwebs, deep pits, and lava.
Resurrector: brings defeated undead back to life during battles.
Berserker and Alpha: high-damage leaders that push forward aggressively.
Healer and Regenerator: recover health over time and support injured mob allies.
Explosive and Assassin: detonate near walls or strike quickly from the dark.

Commands:

/smartzombies config: shows all current mod settings.
/smartzombies reset: resets all options back to default values.
/smartzombies nightinfo: displays details about night progression.
/smartzombies spawnchance <value>: sets the overall zombie spawn percentage.
/smartzombies elitechance <value>: changes the chance for elite zombies to appear.
/smartzombies detectionrange <number>: sets the visual detection distance in blocks.
/smartzombies sounddetectionrange <number>: sets the hearing range for footsteps and noises.
/smartzombies bloodmoon start: starts a Blood Moon event immediately.
/smartzombies bloodmoon end: ends the active Blood Moon event.
/smartzombies trapper cleartraps: removes all placed zombie traps from the world.