Nightmare is one of Elloras sacred guardians, created to bring balance to the world. Nightmare was believed to be lost until the return of Exarahn. However, many great minds are concerned by the stallions presence as the other creatures of Exarahn seem to have suffered from exposure to dangerously unstable magical energy. As a professional student of the ways of spacetime, here is my prognosis. Nightmare could be tamed, but only ny someone with common hunters gear lined with exarium ore to protect them from its magic. Though the price of this kind of armor is rising by the minute, I believe riding one of Elloras greatest creations would be well worth the price.
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How to tame Nightmare
As is the case with all heroic familiars in the Exarahn Badlands to tame one all you need is to be able to lower its hp to 5-10% and tame it! Though having particular gear helps.