Royal crossbow

The Royal crossbow is the crossbow released with the Queen Black Dragon. It can only be made by acquiring the royal crossbow components from the Queen Black Dragon's treasure chest after defeating her. One must attach the components, by talking to Thurgo near Mudskipper Point, to a Coral crossbow in order to create the Royal Crossbow. The components required are: The total cost of the above items when bought from the Grand exchange is. (Not including the Coral crossbow).
 * Coral crossbow
 * Royal frame
 * Royal torsion spring
 * Royal sight
 * Royal bolt stabiliser

You must charge the crossbow up by brandishing it in front of the Queen Black Dragon's extreme fire attack.

The royal crossbow requires 85 Ranged and 70 Smithing to create, and it can only shoot royal bolts but can shoot multiple bolts at once. It works extremely well against bosses and in long fights, as it has a multiplier that gets larger if you are fighting a monster for a long period of time. However, it is useless in Player killing scenarios, where it suffers a damage cap of 60 life points. Attacking another player with the crossbow will result in the chatbox displaying "The royal crossbow feels weak and unresponsive against other players.".

The same 60 damage cap effect also happens at the corporeal beast.

Royal crossbow/Chaotic crossbow/Sighted Magic longbow comparison
The Royal crossbow beats the Chaotic crossbow's ranged attack bonus by 15, making it the most accurate one handed ranging weapon in the game. However, the Royal crossbow can only fire Royal bolts; thus, the Chaotic crossbow still remains the most accurate metal bolt-firing crossbow. The sighted magic longbow beats the Royal crossbow as it is plus 140 ranged attack but must be used with two hands. The higher accuracy advantage of the sighted magic longbow may be curtailed by the Royal and chaotic crossbows' chance to hit higher damage if not as often.

The Royal crossbow has a minimum hit of 50 and a maximum hit of 60 against players, making it only useful for monster killing. It is especially effective in boss battles, since it has a multiplier that increases its damage over time during long battles against the same monster.