The Ossuary dice pile together skulls with large flat numerals (or pips in the case of the four sided die).
This larger 'spin-down' die is not intended to be rolled, but instead used as a counter, to count life-points down from twenty. Each number is on an adjacent face to make this easy to do.
Other Ossuary Dice:
Set of six dice, fifty (count 'em) skulls.
Twenty sided, from twelve skulls.
Twelve sided, eight skulls with side bones.
Ten sided, with another twelve skulls.
Eight sided, built from six skulls.
Six sided, built from eight skulls.
Four sided, a simple tetrahedral pyramid of skulls.