This is a 55mm CHONK Senior. 
 
Unleash the infernal power of Infernal Hex, a sleek black 55mm d20 with glowing red numbers and a bubbling core that pulses with dark energy. Its dramatic design makes it the ultimate showpiece for DMs looking to deliver a shock during key moments.

Roll it for intense combat situations or as a display of power—your players will never forget when Infernal Hex hits the table.

Each order includes a single 55mm d20.
The smaller die shown is for comparison only and is not part of this listing.