This is one of the four armor styles in the Rootworld - a headworld that belongs to NarratedByFate.

Transcription:
"Experienced warrior"
"2,9 m, 9,5 ft"
"1,8 m, 5,11 ft"
"Dwarf Nomarii size comparison"
"Basic Nomarii anatomy template, Nomarii armor, 3rd stage Nomarii armor"
"1,8 m, 5,11 ft"
"Common Nomarii size comparison"
"Inexperienced warrior"
"4 m, 13,2 ft"

Description:
The Nomarii can form an armor around the human being that then acts the same as the second skin. This formation has an evolutionary purpose and is a natural defense against destructive Sevherines. Nomarii humans take the western and northern part of the Root continents.
The common Nomarii stands 4 m (13,2 ft) tall and is common to the mountain area of the Northern kingdom and Emerald mountains and bastions of Nomarii traditions like the Great tree or the capital city Trimariiol.
The dwarf Nomarii is a younger subspecies of the common Nomarii with a subtler frame and temperate size of 2,9 m (9,5 ft). Some nations are even smaller. These Nomarii are common to the post-Arabic Emirates, Rising sun partition or the Cauldron.
As you can see an inexperienced warrior seems very unstable while the experienced one has a perfect grip over their armor.

(Designs are just examples)