Crystal anchor

The crystal anchor was a drop from Crystal dragons.

The weapon used to have a special attack that when used restores prayer fully and drains the other players strength attack and defence by 80%.

Many players ranted in the forums, that this item is way to powerful. Jagex changed it to an untradeable crystal seed. This crystal had an "transform" option, which will convert the crystal into another crystal weapon which the player was able to choose from.

Many years later Jagex brought this weapon back, but changed the special attack that restores prayer by 70%, drains defence by 80%, attack by 40% and strength by 40%.

Odd enough this weapon has a magic damage bonus plus a prayer bonus that making it very popular with pkers but it is very difficult to obtain.

The only way to obtain this weapon is to buy it from the revenant elf who wanders the Wilderness, buy it from the Grand Exchange or buy from another player.

Trivia

 * When the crystal anchor was first released, this hinted at many more types of anchors, like maybe rune anchors or bronze anchors.