The Bloodstone Artifacts are several gems holding great force. They were held by the Forsaken in a secure vault in the Undercity, but were stolen by a group of traitors, led by Kegan Darkmar and brought to the Dalaran Warden Belamoore in the Lordamere Internment Camp. Wordeen Voidglare wants them back in 
[34] Prison Break In.
The bloodstones are:
There seems to be a fifth one which Warden Belamoore studied and was stolen on the way to Dalaran, presumably by the Syndicate. Then the Argus Wake made the [Bloodstone Amulet]s and the [Befouled Bloodstone Orb] out of it to conjure Demons. But it's strange that Wordeen didn't mention this stone when he wanted them regained.
Powers
According to the studies recorded in 
[Belamoore's Research Journal] these stones fool most tests and are neither living, nor dead. They attract and drink blood, which they seem to be made of, and are fused with all elemental forces (fire, water, thunder and rock). She also felt the presence of a deep, hidden, hungry power, yearning for release. Kegan Darkmar describes them as remnants of the Old Gods and terrible weapons.
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This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
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As described, these Bloodstone Artifacts seem to be connected to the Old Gods,as their powers are like the Old Gods yearning for release and holding elemental forces. Kegan Darkmars description seems to be right.