The rhiman are a species of large mammalian bipeds native to Gaia.
Biology
Standing at least eight and a half feet tall, these anthromorphic rhinoceros can weigh over 200 kilos. They are born with a small nose horn and, as they age, the horn grows longer. Around the age of eight, they grow a pair of side horns under and behind the eyes. The nasal horn can grow up to an inch in length while the two side horns can grow up to three inches. It has three toes and four fingers including an opposable thumb on each.
Rhimen live very long lives compared to most specie with the solar system. It is also known that their hide can take ammo rounds that would damage heavy vehicles down and cause them to enter a rage great enough to defy a mortal wounds long enough to kill their attackers. The horns of a rhiman were documented to be sharp enough to pierce a turian without armor on and they could run at a constant 35 miles per hour. A strong immune system can allow for them to eventually heal even from strong radioactive substances.
The current lifespan of the average rhiman is a full millenia although some are known to reach older ages and are deeply respected. Their diet consist of fruits, vegetables, and grains. The last thing is that they're incapable to use biotics as well as have an immunity to biotic attacks. Some members of the specie that have relations with krogans have been known to produce young krogan evey now and again. Salarians who studied the corpse of a 25 year bull found that their body produce a field that prevents dark matter from harming them.
Culture
The rhiman specie and the various sub races grow up as warriors. From the age of seven, they'll learn about their crash's fighting style from close quarter combat to range and vehicle maeintenance. Upon reaching the age of twelve and then eighteen, they'll forge their first set of melee weapons followed by armor. Once they reach twenty, they'll join a branch of service for the next thirty years. All member of the race believe that, upon death, they'll go to a battle field where god like beings would watch them fight before claiming them to serve them for all eternity. Those that aren't chosen are doom to an afterlife of constant fighting until their very soul is destroyed.
The specie as a whole respect strength as well as tenacity. Their is a slight difference between each sub races' with their daily lives.
Red-Face: warrior culture and, through a series of 'pure breeding', are more bulky than the others. When they're not fighting enemies, they are in large arenas called colloseums dueling each others or challengers.
Sword-Horn: warrior culture that believe in enforced doctrines and honor, they tend to be lean body wise. If their not direct fighters, than they're scientist who know self defense.
Field-Breaker: warrior culture that mostly focus on producing food for the people. They're stockier than the others and are less likely to start a fight.
Forest-Tender: warrior culture that are the closest to pacifist for the specie, they're also the tallest of them. Although mostly peaceful, it's known that they're strong enough to knock down full grown trees down in rage.
For these guys, just picture the rhinoceros creature from Star Wars Episode Two as minotaurs.