Bandit's Campfire

This portable campfire takes the form of a black metal disk when not active. It can be lit magically for up to 8 hours per day When the command word is spoken. The fire can be made any colour, or made invisible, emitting no light or smoke that could reveal a position.
Touching the fire (even when invisible) deals 2d4 fire damage.
The fire can spread as normal, but on other things becomes visible.