Appease the monster - willnotgogently (Tonton perhaps?)
The altar the little mech is chained to, is not an altar at all. Not really, not one that is official in any way. Any altar this deity once had is nothing but dust now, ground into the fine sand that the area rests on.
It is the remains of an arena, with the remnants of past lives, battles and death all around - broken swords half buried in the silvery sand, the shells of mechs barely visible beneath the layer of sand, the crumbling walls that still stood tall and the even taller rows of seats stained with the spilled energon of warriors long dead.
It is not hard to realize what, exactly, the metallic, silver sand used to be; victims of the arena, and of the deity it calls home...
The chains are new, though. Shiny and untarnished, hooked into latches buried beneath the sand; standing tall in front of the mech, there is a shield. It's surface is pockmarked with dents, scratches, and burns, but the dark purple metal somehow still shines in the fading light. As the day finally ends, the broken lanterns all around flicker to life. They burn with an unnatural violet flame, casting the ancient arena in a gloomy haze.
The shield moves. It unfolds, twisting, becoming taller, taller, biolights flickering to life in the same shade and manner as the lanterns, until a mech of a deep, vivid purple stands in front of the sacrifice. He bears none of the marks that the shield had; the armored plating is clean and brilliant, lined in softly glowing biolights. Along his arms are gold glyphs; the names of dead champions, each name older than the last, until the language is unreadable.
He takes a knee in front of the sacrifice, gold-tarnished hands reach down to pull them free of the chains, touch gentle despite his size and title; The raging Deity of Gladiators.
"Another one of you," He sighs, in a lilting, melodic voice that doesn't actually come from him, but is echoed from the unnatural lights and the broken blades surrounding them. "What is your name, child? Why have they left you here?"