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Deep in the heart of Cetus, at the edge of the black swamp, there was a light.
This light glowed steadily, with no hint of flicker, though the occasional faint rippling of marsh water lent it a briefly shifting gleam now and again.
Around the glow came, too, the scents of meat and decay--of carcasses, of decomposition, of rot. The combination of light and stench quietly attracted any number of scavengers: fish swam up from the Heart, nipping at bits of stringy flesh that dangled into the cold black, and rats crept quietly from the reeds to sniff around nearby.
What the fish could see, towering above the water, and what the rats could pick out just ahead, was a pile some two meters tall and three wide. Up close the stench was rancid, overpowering, even for the rodents--and was even more frightening when many recognized the carcasses of their own brethren strewn over the top.
It was a pile of bodies. Fish. Rats. Rabbits. Cave rats. A sentient, dismembered deer. A lizard or two. A few hapless cave bats that had been snatched as they dove low over the water, seeking their meals. Some were torn, some half-eaten, some charred beyond recognition. Many were entirely intact, whole offerings to some dark god.
The death-mound had attracted more scavengers, who had been killed and added to the pile, and it had steadily grown over the course of the last few weeks. The more who came, the larger the offering grew, and the more rats it attracted, like some twisted self-propagating flesh construct.
Even now, the reeds nearby quivered; whiskered snout parted long marsh grasses, and a thin, rangy rat slipped out. It sniffed, nose working in silence, then pushed forth into the small black channel of water separating the pile of flesh from the nearby clump of reeds it had come from.
It was swimming with ease--lithe, graceful and swift--and had made it perhaps halfway across the two-foot span of water when a nearby shape rose a couple inches higher in the water. At first glance it seemed to be a log: a floating piece of slimy black debris, nothing to look twice at. But then part of it tilted upward, splitting from the rest, opening a maw of teeth behind which embers smoldered and swelled.
Into the black marsh spouted a gout of fire, powerful and searing, its forked flames tonguing the air several meters away with a hissing roar. It lasted perhaps a second, lighting the dark marsh with bright hot orange light, and then it faded.
When the darkness returned, all that was left of the rat was a boiled, charred corpse, floating slowly on its side until it bumped up against the pile's base, where it swung slowly around and then came to a rest.