The White decorative sword can be bought in the Castle Wars area south of the observatory for 50 Castle Wars tickets. They can only be bought from Lanthus. The white decorative sword offers the same stats as a mithril longsword. It requires level 20 Attack to wield. Also, the White decorative sword has similar shape and color palette to the Blurite sword, which is unobtainable after completing the Knight's sword quest. However, the Blurite sword is considerably weaker.