Balmung deals 25% extra damage against dagannoths and 15% against Dagannoth Supreme with auto-attacks, and 12.5% against dagannoths and 7.5% against Dagannoth Supreme with abilities. It also has a 30% increase in hit chance against them. Because of these buffs, it is considered a good choice when fighting Dagannoth Supreme.
If a player destroys Balmung after Blood Runs Deep, they can retrieve it from Queen Sigrid in the castle on Miscellania. During the quest, it can be retrieved from Brundt the Chieftain. They warn the player that next time Balmung is lost, it costs 300,000 coins to recover.