This is a 55mm CHONK Senior. 
 
Channel the cosmic forces of the universe with Amethyst Nebula, a vibrant purple 55mm d20 adorned with ethereal bubbles and electrifying blue numbers. While this die rolls with a sense of cosmic unpredictability, its real magic lies in its awe-inspiring appearance.
 
Display it proudly, or use it to stun your players at critical moments. DMs looking for a dramatic, out-of-this-world element will find Amethyst Nebula perfect for cosmic or magical campaigns.

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