RuneScape has released dragon crossbow to the game. Dragon crossbow snuck in with the November 20th, 2012 evolution of combat update, but many RuneScape players noticed that it was added to the game. Starting November 20th, 2012, a magic stock was added to the fletching options for magic logs. Requiring level 92 to fletch, making magic stocks grants 100 fletching experience. The stock high alches for 300, making it unprofitable compared to unstrung shortbows and longbows.
Dragon crossbow limbs can also be bought on the grand exchange, at 10m coins. These are reportedly dropped by tormented demons. When used with a magic stock, it makes a dragon c'bow (unf.) Dragon crossbow unfinished is available on the grand exchange for 32,000 coins, but expect it to actually trade for much higher. Level 94 fletching is required to do this.
Adding a crossbow string to the dragon crossbow unfinished gives the RuneScape player three options; dragon crossbow, offhand dragon crossbow, and dragon two-handed crossbow. All types of dragon crossbows are untradable on the grand exchange, and it is unknown if the assist system can be used to make them.