Flint

Flint is a resource obtained from a mountain by clicking on it with a harvest tool, and it can be used to set any flammable objects on fire by dropping and touching them. It has the unique ability to set parts alight that it strikes, provided they are flammable. This is useful for early game lighting and heat.

To rub flammable objects using flint, drop a flint to an object being flammable. Once done, a fire will be created on an object. Water is used to remove flames from any objects being burned or combusted