Two mystics (or other psionic or magic-using class) were friendly rivals in their life-time. Both achieve adepthood at the same time, under the same oak tree and have ever since challenge each other to a series of friendly duels, complex logical problems and finally, the ultimate test, to see if by the powers of their minds alone would they be able to change the world.
When the time draw near for the two mystics to depart from this world, they struck a deal. Each of them, rather to head off to Nirvana, would send their soul into two massive trees, each far apart from each other. From there they would influence events with their powers to improve things for the better. And that they did. The forests which contained those trees began to grow; the soil within became fertile and the fiefs stretching across their influence prospered. Soon, just recently, the boundary of the two forests met.
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