Terrors of the Mountain

Bone Wyverns: The distant cousin to its widely known sibling, this particular variant is leagues more dangerous. While it may lack the poisonous stinger that its cousin boasts; the bone wyvern's segmented bone plates makes it harder for potential competition to harm it, not to mention the incredible reach with all of its natural weapons. It is even rumored to have breathed a gas capable of knocking out most creatures that make the mistake of inhaling it.

Hyper Aggressive Beasts. The males of this subspecies is usually hyper aggressive to any other creatures that wander into its territory. It has been known to render entire mountain ranges void of any local fauna, while it stakes claim to its new home. This behavior is enhanced tenfold during mating season, where gauntlets of combat ensue between bone wyvern males, just to win a chance at mating with the much rarer female specimen.

Vestigial Wings. Unlike its more renowned cousin, the bone wyvern has little use for flying. It's elongated arms seem more suited to climbing, but that doesn't mean the bone wyvern cannot fly, it's just that it's more suited to gliding, as the small membrane accounting for the wing itself is too small to sustain such a large beast in the air. Thankfully, what it lacks in its ability to fly, it greatly makes up in its explosive speed on the ground as its legs are far more developed.

Natural Arsenal. The bone wyvern has a number of natural weapons at its disposal: whether it be the massive horn jutting outward from its head, the razor sharp claws of its lengthly arms, the interlocking hooked teeth of its maw, or the serrated blade-like whip of a tail that can carve a gash into the surface of rocks if swung hard enough. Scholars have documented that these wyverns will usually carry around a portion of a previous combatant impaled on its horn, to ward off any other predators thinking of fighting it, and as if to present a sort of trophy to any potential mates.

Rare Breed. Unlike the abundance of its progenitor, the bone wyverns are surprisingly few and far between - partly due to themselves. Due to the hyper aggressiveness of a male bone wyvern, they are estimated to be the reason for the decline in their own birth rates, as male bone wyverns that encounter another male of their species will usually fight to the death, unless one is cowed, which is fairly rare. It is unlikely that any surrounding local fauna of the mountainous terrains they inhabit would be able to fell them easily, unless of course it was a dragon's doing.