From Fireball "The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried." so yes, Fireball may leave a burning area.
My point is yes, the higher level spell can do terrain effects but not the cantrips or arrows. Save the fancy surface effects for higher level spells to make them special.
Adding to this.
About grease:
Jeremy Crawford
@JeremyECrawford
If the grease spell created a flammable substance, the spell would say so. It doesn't say so. #DnD
Well, that cancels casting grease then lighting it on fire with firebolt.
Now, Web could be fun.
The webs are flammable. Any 5-foot cube of webs exposed to fire burns away in 1 round, dealing 2d4 fire damage to any creature that starts its turn in the fire.
I really do want the surface effects for the higher level spells, it is in the rules, hope they use them.
Last edited by Merry Mayhem; 10/10/20 04:36 AM.