Royal crossbow

The Royal crossbow was released along with the Hobgoblin. 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 speaking with Thurgo near Mudskipper Point, to a coral crossbow in order to create a Royal crossbow (unforged). The components required are: The total cost of the above items when bought from the Grand Exchange is. (Excluding the coral crossbow of course, which is rewarded free upon completion of Song from the Depths). However, this price will not be accurate until the Grand Exchange and market prices have a chance to settle in the weeks following the release.
 * Coral crossbow
 * Royal frame
 * Royal torsion spring
 * Royal sight
 * Royal bolt stabiliser

You must charge the crossbow by choosing the Brandish option in front of the Queen Black Dragon's Extreme Fire Breath (4th Phase).

The royal crossbow requires 40Ranged and 20 Smithing to create and it can only shoot royal bolts. 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." This damage cap is also incurred while fighting the Corporeal beast.

Special abilities
At its most basic the royal crossbow attacks in 3 parts. After your first hit, it bleeds your opponent 8 seconds after, and another bleed 8 seconds after that.

For the first 9 hits (27 damage splats) you have a damage limiter on each hit that seems to max out in the 80s. But each of the bleed hits do that amount of damage (or very close to it). After the 9 hits the limiter comes off and you can reach the max of around 120, with the 2 extra hits still in effect.

So by that the max hit is actually around 360, it just takes it 16 seconds to all come together.

This explains why its important for it to be a long fight. Also if the 2nd bleed hit occurs without you attacking the monster you lose your lock-on. So you have to attack within 16 seconds of the last attack to keep the lock on going. Between that you may switch weapons and do whatever you want.

Royal crossbow/Chaotic crossbow/Sighted Magic longbow comparison
The 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, therefore the chaotic crossbow still remains the most accurate metal bolt-firing crossbow. The sighted magic longbow beats the royal crossbow in ranged bonus by 5, but must be used with two hands. The higher accuracy advantage of the sighted magic longbow may be curtailed by both the royal and chaotic crossbows' chance to hit higher damage, if not as often.

A major drawback to the Royal crossbow is its damage cap against other players: it has a minimum hit of 50 and a maximum hit of 60 against players, limiting its usefulness in PvP scenarios. However, it is especially effective in PvM situations, and particularly in boss battles, since it has a multiplier that increases its damage over time during long battles against the same monster. An exception to this is the Corporeal beast, which the Royal crossbow suffers the same damage cap against as it would against other players. It is unknown whether this is an intentional feature or a bug.

Trivia

 * The Royal Crossbow has a kept on death value of 2,205,000 coins.
 * As you use the Royal Crossbow, it will start to degrade. It is uncertain as to what happens when it fully degrades.