Unable to identify some of the runes, Iṃgor decides to experiment.
He makes sure nothing, that is affected by fire, is near and then speaks with a loud and clear voice while staring at the sword: "I order thee to ignite!"
His main concern was, that the unknown runes prevented anyone but the owner from using it, effectively making the sword simply a normal sword outside of Nawar's hands.
Meanwhile he started searching for the pattern of the unknown runes with his spell, hoping to find them in a book somewhere in town.