For klyros "Their skin is similar to reptiles, being slimy and cold,"
That's amphibians

Reptile's skin is scaly, dry and there body temperature depends on the temperature outside.
"The skeleton is thin and flexible to flight easier, but is easily damaged. Thanks to their body structure, the Klyros are fast in all three elements: air, water and earth."
"Thanks to their triple nature and their easy adaptability to environmental conditions,"
Well this really depends, seeing how they are more adapted to the water it would mean klyros would have a difficult time in dry areas like Oja. Unless they have water pouches on them

They seem very well adapted to the water though so I won't complain there. Air though...Klyros can only glide for a short amount of time and I don't think it would be very graceful with their wings that small and weak.
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For enkidukai "They possess extraordinary acute senses, and excellent reflexes."
The males upper body is so large compared to their legs, they would simply fall down if they tried running and stopping. Their legs don't seem to bend well for running either.
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For dwarves "They have a strong pride that sometimes develops into feuds with other clans or other races. They tend to be suspicious and quarrelsome towards other races that are taller than they are."
No race is smaller then them.
I'll do more later when I have the time.