Heavy Expansion
by metchys_art
Heavy Expansion adds armor, swords and other items for NeoForge, crafted from the heavy core introduced in the 1.21 Tricky Trials update.
What it does
Heavy cores are the starting material. Players smelt them in a blast furnace to get molten cores, then combine molten cores with items at a smithing table to obtain molten items. Those molten items are used to craft new armor, swords and tools, which are shaped like their iron counterparts.
A molten tool is made by right-clicking a crafted item with the corresponding iron tool. A cauldron filled with water yields another new item. The mod is aimed at players who progress through Tricky Trials content and want a heavier gear tier after the heavy core is available.
Installation needs NeoForge only. Heavy Expansion runs on client and server, so the server and every player need it. Files are published for 1.21.4 and 1.21.5, and the code is licensed under All rights reserved, which means the mod is not open source.
Key features
Heavy core progression
New armor and swords become available through the heavy core introduced in the Tricky Trials update.
Molten core smelting
A blast furnace turns heavy cores into molten cores that feed the rest of the crafting chain.
Smithing molten items
Molten cores combined with other items at a smithing table produce molten items used for new gear.
Cauldron item
Filling a cauldron with water produces an additional item that is part of the same progression.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Tricky Trials progression
Players who have reached the heavy core can continue into molten gear without leaving the Tricky Trials path.
Who it’s for: Players and server owners who want armor and weapons based on the heavy core, on NeoForge for 1.21.4 and 1.21.5.
Questions
Does Heavy Expansion have to be installed on the server?
Which game versions does Heavy Expansion support?
In the catalog
Heavy Expansion is one of 17,631 Equipment mods on ModsFinder, and one of 7,420 Equipment mods for NeoForge. 15,307 mods support Minecraft 1.21.5.
Similar mods
What the author says
This mod expands on the heavy core block from the 1.21 tricky trials update and adds a new armor set a new sword and new items paired with it to start you will need a heavy core and put it in a blast furnace to smelt with said molten core when put into a smithing table with these items you will ubtain molten items to…
Official listing
- Modrinth page
- modrinth.com/mod/heavy-expansion
- Owner
- metchys_art
- Published
- 2025-04-03
- Updated on Modrinth
- 2025-04-03
- Facts verified
- 2026-10-15