How to Harvest Iron from Rustlings

Locating Rustlings in Underground Factories

To start producing iron through the mod's creatures, explore the deep underground until you discover an underground factory structure. Stationary mobs known as Rustlings reside within these facilities. Over time, Rustlings naturally grow a crust of rust across their bodies.

Shearing Rust and Managing Rustmunchers

When a Rustling has accumulated rust, use shears to harvest the material directly from it. Take the harvested rust to a furnace or blast furnace to smelt it down into standard iron ingots.

Be mindful of Rustmunchers wandering around the factory. While Rustmunchers protect Rustlings from incoming hostiles, they also automatically eat and clean the rust off nearby Rustlings. Harvest the rust promptly before a Rustmuncher scrubs it away, or build barriers to separate Rustlings from Rustmunchers if you want to farm iron continuously.