The Viridian Balmung is one of three Balmung upgrades as reward for completing the miniquest Koschei's Troubles, released on 18 February 2013. It is obtained by detecting curses on the gem during the miniquest (requires 90 Prayer) and handing it to Kharshai to unlock a new memory. It can be changed into the Achromatic Balmung by right clicking and selecting the "Toggle-colour" option.
When used on dagannoth, all enhanced Balmungs have a 45% bonus to hit chance, and deal 45% more auto-attack damage, or 35% against Dagannoth Supreme. With abilities, the extra damage is 22.5%, or 17.5% against Dagannoth Supreme.
- In Norse mythology, Balmung (or Gram) was the magical sword of the hero Sigurd or Siegfried as known in Germany.
- Wallasalkis are affected by the Balmung effect as if they were Dagannoth.