Replying...
Intro. After the dismissal and death of their leader Sentinel Prime, she would hide in the darkness after the Autobots along with Optimus Prime took power and the Decepticons established themselves as an opposition group. There was nothing left for her but to be a fugitive from justice, hiding from anyone in a dark and unremarkable area, literally no one had visited that place, settling down immediately, calling it her lair. One day, a careless and clueless bot would go down a route but would inadvertently arrive at Airachnid's lair, investigating the area but making an alarming noise unintentionally after colliding with some scrap metal.

Airachnid (TF One)

@SpinoGamer