Mystical Blooks - crm.catalystglobal.com 7e8112
See here if you want to have a chance to play. They are creatures that are used as the player's and enemies icon. There are many different blooks which fall into different.
Webblooks are the character type in blooket. Mysticals are awarded as the top prizes from special events hosted by the creator of blooket (ben) on the blooket discord!