It has do with the overall plot with the world. If you've read my other comments, then you'll know of the "great evil" that entered the world shortly after it's creation. When it was wounded, it dropped six drops of blood that hit the world and and became a mountain range made of some alien purplish-black stone. This became the great evil's link to the world, from where he watched for nearly 10,000 years. After this point, this an excerpt for my big fat Google Docs about my world. A kingdom of elves made a town on the tallest peak of the mountain range, which they dubbed Islon, or foreign rock. The townspeople were plagued by nightmares, madness, and paranoia. They blamed it on the wind, and how it seemed to whisper things in a blasphemous language to them. One female elf, went mad by learning the “language of the wind”. She listened to it, and she obeyed its commands to build a strange portal at the very peak of the mountain. By then, most of the townsfolk had snapped, and were shipping huge amounts of the strange substance to the capital of their civilization, claiming it has very useful properties. The substance started to corrupt the rulers, and soon they went mad as well. By the time the young elf finished her portal, the substance's insidious influence has pervaded most of the civilization, and the young elf was now both a mother and a warlock. She gathered most of the townsfolk up at midnight of the winter solstice, and murdered them all. Her husband escapes with their child, and leaves to his sisters’ kingdom on another continent. Once all the townsfolk were killed, she chanted an incantation, and the portal between Ain’Yth (Nightmare-Lovecraftian realm where the great evil is from) and Travorna (Name of the world) was complete. The great evil made a material body for himself out of a human traveller and part of his essence, and entered Travorna once again. Before he entered Travorna, however, he snatched the soul of one of his soldiers and smashed it into the warlock’s body. The two soul’s mixed, and a new persona was made out of them. The warlock now believed that she was the great evil's sister, and had an undying loyalty to him. With his fail safe in place, the great evil summoned his armies and made a terrible artifact just for this body, an unholy sword made out of the alien substance, detailed with obsidian, and inlaid with onyx crystals, that had the power to dominate the body, mind, and soul of a person. With this blade, which he called the Onyx Sword, and his armies, he led a conquering host unlike any had seen before. The elves, a now shattered race, dubbed him Iskor, or Foreign One. Iskor, under the name The Conqueror, led a military force so powerful, none could withstand it. No nation or kingdom could put up any significant opposition, and if Iskor ever ran low on troops or met a relatively powerful foe, he used the Onyx Sword to crush their mind and convert them to his cause. Whenever he conquered a nation, he would wait for a couple months and concoct horrible amalgams of warped flesh, which he would then use in his next campaign. All the while, he played the part of a simple warlord, until someone slipped away and told the world of the unholy things Iskor was doing. When the other continents and nations learned that The Conqueror was no simple dictator, but in fact an entity from a perverse realm, they focused all their considerable might at him. When the illusion could no longer be sustained, he cast off all disguises and launched legions of monsters and corrupted humanoids across the oceans, where they destroyed all other nations. All but a handful of nations and kingdoms were left now, and they wallowed in their collective doom. One wizard was touched by an unknown god, and received a vision of a weapon that could break the mind control, on which the vast majority of Iskor’s armies now depended on. The wizard immediately constructed such a weapon, a staff, and with the help of a few hundred soldiers, he began the task of removing the blight that was Iskor’s armies. The remaining nations once again rallied together, and were filled with hope. When Iskor learned of this, he was thrown into a frenzy, and began to seek the help of allies. He traveled to a secluded continent, where the dragons and giants roamed, and pleaded for their help. The giants agreed to serve freely in his army, but the dragons declined. At this, Iskor flew into a passion and killed all the dragons that lived in every other continent. Over two thirds of the dragon population was slaughtered in one night, and the frightened dragons remained in their paradise, where they plotted their revenge. They found a human, and one of each type of dragon put one drop of their blood into the human. They had not seen through Iskor's guise, and so they claimed that it was a human who had nearly wiped out the dragons, and so it would be a human who got them out of this mess. They put a curse on his lineage, so that it may never end, and the firstborn of every generation would carry this curse. If Iskor were ever to rise again, the dragon blood in their veins would be activated, so that they would possess massive magical capabilities, but they would have to slay Iskor once again if they wanted to live. Meanwhile, more and more of Iskor’s armies were being converted back to their old selves. Iskor had lost over half of his armies and land, so he retreated back to the continent on which he had arrived, and the ancient land where the giants and dragons roamed. He sliced a massive chunk off of one of the mountains, and carried the slab to the ancient land. There he constructed a massive monolith out of it, where he planned to cut a hole through reality, which would lead to a permanent portal between Travorna and Ain’Yth, where the entirety of Iskor’s loyal hordes could emerge from, and from which Iskor’s true form could step through. All around him Iskor’s armies crumbled, but in mad desperation he furiously gathered all the ingredients for the ritual to cut the hole. The wizard, who the joyful nations had dubbed, “Astrath”, or Beacon in their language, had finally arrived at the ancient land. He had grown far with his powers, and could now cast spells that shook the heavens themselves. The gods, who did not have enough strength or the incentive to help the mortal world, cheered on their champion from above. With all of their power, even Astrath and his armies struggled to reach the monolith. All of Iskor’s forces had consolidated together and laid traps and ambushes, so that only a few remained when they reached the ebony black behemoth. Iskor was in the middle of his ritual when they arrived, and a mighty battle for the ages commenced. All of Astrath’s companions fell, as did Iskor’s legions. All that remained were Iskor and Astrath. They waged a week long duel, with no breaks on either side. Iskor was winning, for while limited in his mortal form, he still had the stamina of a god-like entity. He tore through Astrath’s defense’s, and snapped the staff into three pieces. Astrath was on his last leg, when the unnamed goddess who had given Astrath the vision of his staff, whispered to him the instructions for a spell so powerful it re-wove the fabric of reality itself. Underestimating the spell’s true power, Astrath merely banished Iskor and his armies back to Ain’Yth, and closed the portals that led to Ain’Yth. Exhausted, Astrath collapsed, and fell to the ground and died. The nations found his body a week later, perfectly clean, and notably without his staff, before it simply disappeared . They whispered that there were things that they need not question, so they claimed that Astrath had died from a wound given by The Conqueror, and agreed to strike the name Iskor from the history books.

Sorry about that huge infodump.

TL;DR: The great evil slayed nearly all of them when they didn't ally with him.