Progressive Core Unofficial

The mod is organized around seven tiers of ores and alloys. Each tier requires ores or alloys from the tier before it, so players work through the chain in order. Ore generation, tool and armor stats, and most other values can be changed in the config file, and recipe edits are made there as well. Forge is the only loader, and the mod is published for 1.12.2 alone.

Smelters handle the alloys. Four smelter tiers are named Basic, Bricks, Advanced and Bronze, Infernal, Hellsteel and Titan, and Titanium is the Tier 7 smelter. Each smelter has six input slots, one output slot and a fuel slot. A regular furnace can smelt vanilla ores into the mod's own ores. A higher-tier smelter shortens smelting time for recipes that need it, by up to 25 percent. Later in progression, a gem polisher and an eye of reality help players finish the chain. The gem polisher is used with the Titan Crusher, and the eye of reality highlights nearby Tier 7 ores in a 24 block range.

Each smelter tier upgrade adds new recipes and can change stack sizes or recipe outputs. Just Enough Items (JEI) is an optional dependency, and with it installed the smelters show the recipes they can make. Every player and the server need a copy of the mod. The license is All rights reserved and the project is not open source, though public links to the source code and issue tracker exist.