First Hellcephiran was a descendant of two essences -Ymreiva and Lwiviear.
While still looking much like normal humans, hellcephirans are taller and have special features exclusive to them. Members of this race will have horns and tails that allow them to collect more energy than a regular human would.
Aside of classic differences between males and females, hellcephirans also have one more thing that distinguishes their genders. Females have small triangular horns whereas males have long and more curly horns. Not sure if the person you're looking at is a guy or gal? No need to look in their pants anymore, just check their heads!
Hellcephirans are one of two races capable of using advanced skills. Their affinity with energy makes them also unable to die of old age (although they are not immortal, they can be killed). They can manifest their energy in form of wings (1-3 pairs depending on how big their energy pool is). Maintaining these wings drains their powers so they are unable to use them for flight, they exist purely to show off or increase their leap distance.
Excessive use of energies prevents the cells of their bodies from aging. Due to that, hellcephirans prefer to use words describing their life phase rather than actual numbers for age. Newborn (Under 1) Toddler (2-4) Child (5-12) Teenager (13-18) Young Adult (19-30) Adult (30 and more). All activities involving energies are prohibited before reaching age of eleven. Until age of seventeen only mild activities are allowed. A hellcephiran of age eighteen and more can start a proper full training as the energies won't be able to slow their growth down anymore.