Sophonts 2: different biochemistry

Hnaur: The arsenic-based mammaloid Hnaur inhabit a tidally locked dwarf double planet. The rotational axis lies between the two planets and they always present each other the same face. From any position on either body, the other is always at the same position in the sky, or always obscured. The Hnaur terraformed their once lifeless neighbor and connected the two planets via massive towers and hyper-speed space elevators. Despite being highly advanced, the Hnaur's culture is based on a profound spiritual connection to nature. 

Hchrrm: Inhabiting a dry super-earth, the silicon-based Hchrrm are more alike to machines than animals. Their grid-like nervous system works at astonishing speeds, providing them with lightning-fast reflexes. The sensory bristles on their cephalic shields pick up radio-waves emitted by their kin. All their technology is naturally grown from engineered "animals" and "plants".  
(juniorwoodchuck.deviantart.com…)

Gnyogshotha: These ammonia-based sophonts inhabit a large gas giant near the center of the milky way. They stay afloat due to gas bladders inside their bodies and propel themselves forward with the aid of two large siphons. Their architecture is largely based around the porous skeletons of other creatures. Their society is divided into multiple castes that are distinguishable by their appearance. The warrior caste is the most powerful one, ruling their people with an iron facial trunk. 

Hedron: The Hedra are metal-oxide-based sophonts inhabiting an oceanic planet orbiting a black hole. Despite being a relatively young species from an outsider’s perspective, the Hedra are highly advanced. This is due to the massive gravitational fields emitted by the black hole cause time to slow down for their homeworld. Every hour on the planet means several years outside of the gravitational field. The two-mouthed bodies are lined with 24 fins and ten compact eyes on either side of the body.
They do not exhibit any manipulatory organs but interact with their surroundings through electromagnetic fields they generate with multiple coil-like organs inside their "head".

Pfwyt: Hailing from a planet of methane and hydrocarbons, the Pfwyt superficially resemble Terran mammals. Upon closer inspection, one can see the many differences however. Their eyeless heads are equipped with a toothed proboscis as well as a small tentacle used in communication and chemoreception. Their chins are adorned with a single bifurcated grasping arm. Two antenna on their forelegs help them pick up movement in the air and flower-like organs on their back legs help them discern light from darkness.

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