Behirborn

Behirborn are humanoids descended from the monstrosity called a behir, a twelve limbed, blue, lightning breathing serpent foe of dragons created by the ancient Giant Lords. When the Primordial Dragons created the dragonborn, the Giant Lords created the behirborn to counteract the dragons.
Behirborn are humanoids with blue skin and small horns, though they lack hair. They have long torso with four arms that have sharp claws. Like the behirs from which they are descended, any behirborn is able to breath lightning. Their bodies are covered in smooth scales and have serpentine tails.
Behirborn communities are most often found in mountainous regions, caverns underground, or among communities of giants. These communities are strong oral traditions that relate their origins and the long history of warfare between the giants and dragons. Many of the stories passed down the generations depict giants as the heroic protagonists, though many contemporary behirborn understand the bias implicit in their old stories. Behirborn community traditions often include athletic competitions, especially wrestling. As a result of their giant origins, behirborn societies tend to have a hierarchical structure.

Source
More Ancestries and Cultures by Arcanist Press

Scientific Name

Gigas draconis fulminis

Lifespan

120 years

Average Height

6' - 7'

Average Weight

130-150 lb.

Behirborn

Ability Score Increase +2 Strength, +1 Wisdom

Size Medium

Speed 30 ft., climb 20 ft.

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Age. Behirborn are born from soft-shelled eggs and mature at the same rate as humans, though they live a bit longer, to at least 120.
Size. Behirborn are slender and tall, standing well over 6 feet tall, but weighing as much as a human. Your size is Medium.
Speed. Your base walking speed is 30 feet. You have a climbing speed of 20 feet.
Four-Armed. Behir often have ten to twlve limbs along their long, serpentine body, but behirborn only have six--four arms and two legs. Having four arms allows you to wield multiple weapons or have an extra hand to cast the somatic component of a spell, though they do not grant additional attacks. You can take the Use an Object action as a bonus action.
Climbing Claws. Behirborn have sharp talons on the fingers of their four arms that allow them to make unarmed strikes as well as to climb more efficiently. You have a base climbing speed of 20 feet. You can also scratch as an unarmed strike. On a hit, you deal slashing damage equal to 1d4 + your Strength modifier.
Lightning Breath. Behirborn can make a breath weapon attack, shooting lightning in a 5-foot wide, 30-foot-long line. When you use your breath weapon, each creature in the area of the exhalation must make a saving throw. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 lightning damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. After you use your breath weapon, you can't use it again until you complete a short or long rest.
Lore of the Dragons and Giants. You have heard the tales a thousand times and know more than most of the lives of giants and dragons. You have proficiency in History. When you roll history to recall lore about giants or dragons, you roll with advantage.
Wrestler. Those who live in behirborn communities often take part in regular wrestling competitions. You have proficiency in Athletics.

Languages. You speak, read, and write Common and Giant.

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Base Height	Base Weight	Height Modifier	Weight Modifier
5'6"	110 lb.	+ 2d8 in.	x 2d4 lb.