“There were at least five blunt force injuries to the forehead and head area, with underlying severe skull fracture and severe brain fracture identified.”
“Three of the five injuries could have been caused by mild to moderate force being used - but added that the two which smashed the skull must have involved "severe force".”
“The features of this wound would be consistent with being caused by a heavy, round, blunt object, such as a hammer or something with similar features.”