Kalinar

A land of dream and nightmare, Kalinar is a world that in times long forgotten was ravaged by ancient magics. This land is wildly contrasting and alive with arcane power; magically supported bluffs towering thousands of feet in the air, valleys that suddenly drop endlessly into a magical abyss and floating islands traveling reliably between different planes of existence or simply drifting steadily around the lands below, prime places to build incredible trading cities.
Kalinar is indeed a world of great magic, though this ranges from area to area. In some lands necromancers and wizards rule supreme with unbelievable power due to the incredible density of magic in the land; in some spaces the more brutish races and their powerful warlords rule their territories with brute strength and tactical prowess. The majority of the land however is somewhere in between, in these areas of moderate magic those gifted with arcane and intellect and those gifted with brawn and cunning who have chaotic tendencies vie endlessly for land, money, power, love, their beliefs or the wills of their gods.
Due to this patchwork distribution of magic the borders of kingdoms, regions and territories often very closely resemble the borders of the different levels of magic. This makes invasions incredibly difficult in cases where one's army would be forced to fight in a different level of magic and then made doubly so because of the drastic changes in the geography itself. A low magic-forest would be fairly mundane, however upon entering a high-magic forest in one area you would be confronted with magical flowers taller than mounted human cavalry and trees with trunks as wide as an entire castle which rise for thousands of feet, their individual canopies and root systems spreading majestically over many miles each; a high-magic forest in another land is filled with seemingly normal vegetation which produces spores which cause wild hallucinations and visions.
Kalinar is in constant strife, in its chaotic history it has been invaded by multiple armies from other planes ranging from demons to astrals and had internal wars ending in tens of thousands of casualties; a necromancer once raised an army of millions with his many followers in a high-magic land only to be undone by a single cunning paladin championing his god's will. Kalinar is a land ripe with thousands of do-gooders and criminals, many renowned champions and nemeses and a handful of true heroes and cunning masterminds many of whom are simply pieces being moved and taken subtly by the many gods, devils, deities and supernatural or otherworldly beings in their titanic eternal struggles for power.