Homebrew
Starve Fire
2-level Conjuration
Range/Area: 30ft or 10ft Square
Components: Somatic
Duration: 30 Minutes
You create an area a maximum of 10 feet square in a space you can see within range. Within this space, a vacuum of air is created. Without oxygen, any fire within the space is starved and extinguished if the spell is held in place for enough time (this is determined by size of fire - small fires might take seconds, large fires a couple of minutes). During this time, the spell requires concentration.
At higher levels: When you cast this spell using a spell slot of 3rd level or higher, you can create two additional spaces of no air for each slot level above 2nd.
Available for: Artificer, Druid, Ranger, Sorcerer, Wizard