Prestidigitation. One of its effects is that you can "instantaneously light or snuff out a candle, a torch, or a small campfire."
I'm used to the houserule that it's a "fire the size of" on of those, and not those three things specifically. (Always struck me as odd you can light a candle but not a lamp, and if you move that same campfire into a fireplace you can't light it or put it out.) But I wanted GM approval before I start doing things that don't technically follow the rules.
So for me, I think the intensity of the fire is greater than that of small campfire, but I like the idea, so you can use prestidigitation to make a ranged attack on the fire. It is unusual for this to be an attack roll, but I like the idea of the fact that this fire is basically actively trying to spread, whereas a campfire isn't.
Could I use the damage of an Ice knife spell, specifically the 2d6 cold damage over the area to extinguish the fire? Target the "center" attack AC 12, then snuff it with the burst damage?
Could I use the damage of an Ice knife spell, specifically the 2d6 cold damage over the area to extinguish the fire? Target the "center" attack AC 12, then snuff it with the burst damage?
Suppose this is a good time to check... by RAW, an attack of opportunity is a melee attack. Are we sticking with that, or houseruling to allow spellcasting?
You can really only blow out a fire when it's small. When you're lighting a campfire, for example, it's easy to blow too hard and put it out.
But remember, blowing is also what causes it to catch and spread.
Once a fire reaches a certain size (and it's not really that big) you can't blow them out with anything short of extreme winds. And even then, if the fire is big enough it will only spread. Water becomes essential... a driving rain will put the fire out, but it's primarily due to the water.