Jenova
Jenova is the Township of The Jihad. In the year 1269 AC, a large fragment of the RoK separated itself and began to fall. Those of the Jihad took an interest, and prevented its fall. Instead, they bound it with great magic and they began to build homes there. And life has begun to flourish... so much as it can aboard a fragment of the RoK.
Ragnarok was a twisted thing whose very essence was a corruption of life. The Black Lifestream, the counter-part of the True Lifestream, was used by the Jenovese to twist creatures into abominable mutations for use in battle. Even the denizens of Jenova themselves had been known to volunteer for this process, becoming mighty Ragnarok Demons and Golems, though few survive the process.
With the inception of life on the RoK, other events had occurred. The native monsters had vacated, either by being destroyed or by leaving for easier people to prey upon, and other life had evolved. Rokwood, the newest of these, had begun sprouting like wildfire across the vast caverns of Jenova.
Black Makou
Black Makou was produced, harvested, and used as fuel and building material for great airships previously unavailable to the Jenovese military. And other, darker things had been slowly stirring to wakefulness in the depths of Jenova's many caverns.
Rokwood
Rokwood was a wood exclusive to Ragnarok. These trees grew in large clusters along the walls of the deep caverns within the Rok, where the corrupted Lifestream flowed strongest. Due to their close proximity to the source of Black Makou, these trees seemed to have a dark, magical nature. These trees had thick, intertwining roots and thick, squat trunks. Their foliage was comprised of brittle, thin branches which ended in a single, razor-sharp spiked leaf. Their trunks were black, gnarled, and covered in a fungal slime.
Once dried, however, the wood of these trees was among the finest in Faerun for buildings and tools. The process of drying Rokwood was slow and painstaking, for if it was dried too quickly, it became as brittle as its branches. If it was dried too slowly, the wood became unworkable.
Perhaps due to its magical nature, the wood of these trees functioned poorly fashioned as weapons- becoming brittle as eggshells when used in combat. The exception to this rule, however, were the arrows made from their branches. Their fragility, instead, proved to be an asset when a foe sought to remove an arrow shot into him, and found he cannot, as the shaft had broken, and the arrowhead remained lodged in the wound. Their leaves, also, were highly sought for creation of caltrops and other sharp wooden instruments, as well as by wizards for the creation of magical blades.
In the spring, Rokwood produced a small acorn-sized nut. These nuts were inedible and highly toxic, however among clientele of thieves and assassins they were highly coveted for work in poisons, and by wizards practicing the darker arts. Rokwood was barren the other three seasons of the year.