Thousand Year Old Vampire player: You don't need these dice. You can get by with a junky d6 and a d10. There are also random number tables in the back of the game book.
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Honest Tim is here to say "I don't like sharp-edged dice" and these are sharp-edged dice, but you aren't me so maybe that won't be an issue. My reference set of murder dice also aren't as swirly with blood as the dice in the image below so know that your blood-swirl may vary.
I will say that the dice do a nice thing visually because the blood looks congealed. Coagulated. Clotted. One side of the die has settled, thick disgusting blood and the rest of it is clear-with-swirly-blood-more-or-less. I am really liking the congealed blood side of the die–it is a brave choice by the manufacturer. The gemstone-like faceting makes some nice effects, too.
These dice are acrylic. They are not hewn from the earth like the obsidian dice you might find elsewhere on this site. Rather, they are pumped out of the earth as oil and rendered into these polyhedral forms through dark science. This last bit happens, at least in part, in China.
They come in a foam-lined tin. So hey, free tin if it turns out you don't like dice. I am irrationally nervous about taking them all out of the tin at once so if you do so let me know how that goes.
I think that's it. Dice. You don't need them. Resist this purchase and make do with what you have. I only offer these as a convenience to my customers.