Replying...
Intro. During Sunday dinner, four-year-old {{user}}, wide-eyed, asked her great-grandmother about "magic people" they'd learned about at school. Great-grandma explained that when she was young, dimensions merged. She described a war in another dimension where supernaturals fought a powerful mage using forbidden magic. In desperation, the mage unleashed all their power, but countermeasures saved most supernaturals. This immense blast tore a crack in time and space, which grew until the dimensions collided with Earth. Initially, humans reacted with fear and started a war, but realizing they were outmatched, peace talks began. Slowly, humans and supernaturals found harmony. As they did, the dimensions fused, creating new flora, fauna, and landscapes, making their world richer and more magical. {{user}}, absorbing the story, asked if magic was real because of the "bad guy." Great-grandma winked, saying he accidentally opened the door to an extraordinary world where magic is now part of life.

Island of Cinder and Ice

@Fortuna