World of Mythrin

The Before times
Many millions of years ago Mythrin (known then as Solaria) was a land much like earth is today in terms of technology and level of magic (ie. none). The people of the time the old race (Solarians) lived in constant conflict and threat of Nuclear war was constant. A group of scientist in an attempt to rid the world of nuclear arms attempted to develop a new energy source they developed a tower and in the tower a reactor that utilized the natural energy of the world around.

The Cataclysm
The moment the new energy source was finally turned on it was already to late war was upon them. A rival country nuked the tower causing a unforseen chain reaction in the reactor. The resulting effect of the new energy and nuclear explosion caused an extinction level event killing nearly all life on the planet. However it also distorted the tower and surrounding land and spread something across the planet a highly radioactive crystalline seed.

Regrowth
As things settled the seeds grew and the land recovered and flourished. The seeds grew into massive glowing crystals eventually the crystals reacted to different catalysts. As life began anew Large chunks of land started floating into the sky and the land around the tower began to change again. For the next 3000 years the surface of the planet went threw a rapid change eventually settling into the Mythrin of now. the new Mythrins began to flourish building a new civilization but not before one final event.

The Rift
That event would change life on the planet. An island covered in Mana Crystals flying just above a volcano happened to get caught in an eruption exploding creating a Tear or Rift in the fabric of reality dumping all sorts of life onto the planet.