Technological development without fire.

[Culture20]

The cook spell takes care of food prep and replaces smoking for food preservation. Essential wood can harden javelin and arrow tips. Various earth/metal spells can replace the need for fire in a forge. Light spells cover fire's second biggest benefit. A simple warming spell would help with fire's biggest benefit. The only thing you lose is the chaotic destruction of an uncontrolled fire (and fatigue points).