How do I gain heat?

[Else]

I see heat is useful for many purposes but I have a hard time gaining it, how can I get more heat quickly?

[Lazarus]

If you're talking about Heat as in Heat scars, you can do this by merely fighting.

You can gain more usable heat by increasing your briskness, sacrificing a creature, fighting, walking around (if briskness value is high enough), or releasing stored heat from your Erolin device (heat container).

[Dracoloth]

Heat is gained mainly by walking around, depending on the location viscosity and the territory you can either gain or lose heat.