OOC: Going to pop in an action in the middle of your post, hope you don't mind. Also, how do you want to do dice rolls? Our end or yours?

As the party leaves Magnimar, Gratianus summons Nerva to join them on the road.
Seeing the burnt wreckage, Gratianus kneels to inspect it, focusing on the charred edges to see if he could recognize the type of fire (probably Knowledge (Arcana) to determine if the fire is magical, and if so, maybe to identify a likely source), trying to keep his mind off how pretty the fire must have looked when it was burning. Nerva, meanwhile, prowls around the area, searching for any sign of other creatures, still present or not (Perception for other creatures currently present and for tracks).