The Scrimshaw of Cruelty is available from the Player-owned ports update. This item requires 92 Fletching and 10 ancient bones to make, as well as unlocking the workshop where it's made. It also gives 4200 Fletching experience. When equipped, this scrimshaw gives ranged hits a chance to cause bleed or poison effects. It lasts for three hours, after which it crumbles into dust.
The damage of the poison inflicted is dictated by the damage of the hit you inflict divided by 5. Hitting a 2000 will have a chance of poisioning the creature 400 damage 5 times (effectively doubling the initial hit over time).
The chance of inflicting poison is estimated to be between 10%-20% per successful hit.
On 20 January2013, players discovered a bug with the scrimshaw where the poison effect would persist even after death in certain minigames. Mass casualties ensued, as some unfortunate players were trapped in death loops until a fix could be deployed.
Another bug with the scrimshaw was fixed on 9 April2013, in which a player poisoned by it would be permanently poisoned until they cure themselves or die.
The Queen Black Dragon does not get damaged by the 'poison splats' at all if this item is equipped while fighting her. This is not a bug, as she is immune to the effects of poison (this also applies to any monster with poison immunity). However, it can still cause bleeding.