See my example. Re: start a campfire vs add to a campfire.
Plenty of greases will burn if you add them to a campfire. Sure. So will a solid block of oak. Even a freshly chopped one if you give it long enough.
But you wouldn't use them to "start" a campfire. Because they're not flammable enough.
That's a pretty good threshold between flammable vs combustible. Not super technical either. Relies on basic common sense.
I'd just go with did you do enough damage to "kill" the object with fire, if so, it bursts into flames. The damage object rules in 5e are very sparse and items have pretty low hit points but its the only thing rules wise i can see. Some things will go up easier as they might be vulnerable like kindling or dry leaves, but again with how low the hit points are most things would go up quick anyways when a PC starts exerting fire based attacks. Lets assume not the spell but say a PC pours out a cauldron of grease in a kitchen to set up a trap. Lets call it large and resilient, so 27 hit points. That is about as tough as you could go, personally I'd go less as I'm thinking weaker than a wagon, tougher than a barrel, so large and somewhere between fragile and resilient.(odd to me they don't have a mid choice actually listed as opposed to I guess implied) Depending on level that might be a decent number of firebolts, but a single fireball would probably set it alight.
Though all of this is kind of irrelevant as the argument somehow shifted from can it be set on fire to is it super easy to set on fire.
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I'd just go with did you do enough damage to "kill" the object with fire, if so, it bursts into flames. The damage object rules in 5e are very sparse and items have pretty low hit points but its the only thing rules wise i can see. Some things will go up easier as they might be vulnerable like kindling or dry leaves, but again with how low the hit points are most things would go up quick anyways when a PC starts exerting fire based attacks. Lets assume not the spell but say a PC pours out a cauldron of grease in a kitchen to set up a trap. Lets call it large and resilient, so 27 hit points. That is about as tough as you could go, personally I'd go less as I'm thinking weaker than a wagon, tougher than a barrel, so large and somewhere between fragile and resilient.(odd to me they don't have a mid choice actually listed as opposed to I guess implied) Depending on level that might be a decent number of firebolts, but a single fireball would probably set it alight.
Though all of this is kind of irrelevant as the argument somehow shifted from can it be set on fire to is it super easy to set on fire.