Calm down, man. They're part of a new collection - the Descent's version of "Bottles of Thedas". You don't do anything WITH them. The "point" is to collect them and put them on that table. And you of course get a bit of EXP/Influence for finding them all. And speaking of, I'd be interested to know where you actually found Wraith Blood, because I missed it somehow.
You can find the Wraith Blood Mug on the 2nd floor where you do the Builder's Tower puzzle. Destroying the crates in the room exposes a doorway to a cavern, where you will find the mug.
