This design was also done for a fellow Tenno of the Warframe community. I was scrolling through the Warframe Discord and saw the player's concept written as well as various references to what they wanted the frame to look like in terms of inspirations they were drawing from and thus the Arachne frame design you see here was created.
The design drew heavy inspiration from the boss battles on the Orb Vallis. The large mechanical orb-like spiders crawling across the frozen landscape was something I really wanted to attempt to put into a warframe design and so this was what I came up with, keeping with the insect elements as well with the glowing mandibles on the helmet and the spider-like thorax.