A clear glass die with a potion sealed inside it. The aqua core sits suspended at the center, bubbles and all, and the glass around it is genuinely see-through, not painted on. Silver numerals ride the outside, bright against the clear shell. The full polyhedral set plus a d2 and a d16, every one cast clear.

Alchemists' dice, the story goes: a glassblower's wager that a draught could be sealed mid-pour and never settle. The trick was never the glass but the blowing of it, thin enough to vanish and thick enough to survive a table. Tavern lore says a potion die rolls truer when the drink inside matches the spell you are casting, which is the kind of thing said by people who have lost money to one.

1 sets containing 9 dice