Assertion: obsidian | /r/Synonym | dragonglass
Facets:
value: because of the presence of dragons
type: CAUSE
value: throughout the series
type: TEMPORAL
Source sentences:
text: In the fictional world of the A Song of Ice and Fire and Game of Thrones stories, obsidian is called "dragonglass".
text: Obsidian is known as Dragonglass throughout the series because of the presence of dragons, which in reality connects to the fact that obsidian forms due to the quick cooling of volcanic lava.