Farming Gem Zombies with a Monster Spawner

Locating and Securing a Spawner

Because Gem Zombies can spawn anywhere normal zombies appear, they will naturally generate from standard vanilla zombie dungeon spawners. Finding a zombie spawner provides a continuous, renewable source for collecting all 12 gems.

1. Search underground for cobblestone and mossy cobblestone rooms that house a zombie spawner cage.

2. Place torches directly onto all sides and the top of the spawner cage immediately to suppress mob spawns while you build.

3. Clear out the dungeon room to a standard 9x9 area with the spawner centered, leaving at least three air blocks above and below the cage.

Building the Collection Chamber

Create a basic water-flow trap to funnel all generated zombies to a central killing point:

1. Place water source blocks along one wall so the current pushes mobs toward the opposite trench.

2. Route the trench to a single drop shaft where zombies fall into a confined kill chamber.

3. Leave a half-slab opening at the bottom of the kill chamber so you can strike the zombies' feet with a weapon without them hitting you.

4. Remove the torches around the spawner cage and seal the chamber.

Defeat the trapped zombies manually to collect their drops, gathering pearls and assembling your full set of Effect Gems.