The Lord of All Dungeons

Jason Reynolds has always been different. Growing up in a society where the strong rule over the weak, he was taught from a young age to always be cautious of other people's actions and he, therefore, grew up with few to no friends. Even the few people some may consider his friends are actually just acquaintances who he can get rid of at any moment. Calm and collected, he weighs the pros and cons of every situation. Why then did he choose to have the core of an unknown creature when he had the option to choose kobolds, goblins, elementals and more? Perhaps he saw their potential. Perhaps he knows something others do not. An unknown core, a core nobody has seen before. What could make it special?