It's you. There is a low, persistent hum emanating outward.
Perfect
Fuming God-Child player (left) with You, but mechanical as their pet (right)
You, but mechanical is a pet, a companion to the player that can be selected during character creation, available exclusively to patrons of Freehold Games. They are, as their name implies, a mechanical version of the player themselves.
You, but mechanical uses the same tile as the player colored cyan, and their display name will be "mechanical [player's name]". However, many of their properties differ from the player: they will have different attributes, and they will not begin the game with any items, skills, mutations or cybernetics that the player starts with.
Due to their mechanical nature, You, but mechanical will have their default heat and cold resistance set to 25, and their electric resistance set to -50. Additionally, You, but mechanical lacks a mind, is made out of metal, is EMP sensitive, does not respire, is immune to poison and the effects of fungal spores, and is unable to utilize tonics. Finally, You, but mechanical bleeds oil rather than blood.[1][2]
Recall Story
Swapped
"Hey, Yybas."
"Yes?"
"You ever worry that you might get... swapped? With a robot?"
"Swapped? How do you mean?" Yybas stopped heaving straw to turn and glare at Mukas.
"With a robot, like." The farmhand fidgeted, his resolve faltering upon hearing himself speak the words aloud. "They build a robot s'just like you."
Yybas scowled. "Why would anyone do summin like that? For filthy pig rasslers like us."
"Hey!" Mukas scowled. "I en't filthy."
"Yer muddy, I know. Get yer muddy behind back ta work and stop worryin about robot impostors. Moon and Sun, what a fool you are."
Thus chastised, Mukas slunk from the barn with his shoulders sagging. Huffing a sigh, Yybas planted her pitchfork in the hay and stared after him. She waited until he was gone, until the only sound was the whirring from Yybas's chest.
oil rather than 
blood.[1][2]
congealed love, which is commonly sold by 
kippers.
missile launcher has the same tile and name ("strange tubes") as a 
metal folding chair.
neck-ring, its description stating that it is "bespattered with worm blood", and the fact that it is actually worn on the arm.
salthoppers tile, which many believe looks like a rabbit.
