The Marble Fire is used to keep your villagers warm and safe from predators; this fulfils a need in order to keep them carefree.
The Marble Fire takes 6 days to unlock, and 4 days to build. This requires 50 Marble blocks and a Marble Hammer.
The Marble Fire will burn for 16 hours, and requires 30 Mahogany planks and 2 Flint Shards to light it.
By adding 200 Oil canisters to the fire, the burn time can be extended by 12 hours.