Although too brittle to fashion into swords, dragonglass is extremely sharp and could be made into highly effective daggers, arrowheads, and even spear tips. The Children of the Forest utilized dragonglass - a black volcanic rock also known as 'obsidian' - to craft their blades. In Westeros, the use of weapons dates back to the Dawn Age.
A cache of dragonglass weapons were found buried at the Fist of the First Men.
