Slammer Boss
Java mod listed for Minecraft 1.21. File opened and checked on 16 Oct 2026; downloads from the MC Java Mods app on Android.
I don't know my version or loader
Introducing The Slammer boss, this mod adds a new boss to the game that spawns in a new structure, the structure appears in any jungle biome,
Upon finding the structure you will need to craft a heart of the earth:
once you have this crafted you can then right click it on the slammer to awaken it!
The boss has 3 attacks:
Slam - It will smash its hands on the ground dealing damage in a radius and setting off a effect
Throw - It will throw rocks at you healing high damage
Minions - It will spawn mashers that try to attack you
Killing the boss:
the boss don't take damage to any damage source so you have to kill it by picking up the rocks it throws and throwing them back at the slammer, Once you have kiled the slammer it will drop a slammer items and that works like a pickaxe but mines 3x3
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.7, 1.21.6, 1.21.5
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as SlammerBoss-Neoforge1.21.7-1.0.jar — drop this file into the mods folder
- Download size: 352 KB
- Download link checked 28 Sept 2026 — working
These come from our own check of the pack file, not from the source page.