In the final stage of Dragon's Lair, Princess Daphne tells Dirk that in order to slay the dragon, he must take the magic sword.

In the first issue of the Dragon's Lair comics, the Wizard apprentice tells to Dirk and Laraene that Singe is not an ordinary dragon and can't be killed by conventional weapons (perhaps because he is one of the Elder Dragons). He can be killed only by the Dragonfang, which perhaps he keeps inside dragon amber in his castle.