Well, bring on the magma. Lessee;
Name: Sabt Golgo, The Great Spider of the Twilight
Elemental Concept: Transition/Change
Appearance: The Great Spider dwarfs mountains, men say, spinning her webs low upon the night sky. She is void-dust and light given form, a shimmering, transparent giant that the stars shine through. In her shadow, the earth is wreathed in shadow, full of things that would have been and should not be, images of past, future and other presents spun into existence from the minds of mortal men. The ethereal spider flickers through the physical world, Her vast body mere shadows and mist one moment, clad in all of her fearsome radiance the next. Where Her gaze falls is bathed in treacherous false-light, suffocating the gentle sun and moon.
Men say many things - few have truly seen her. The Great Spider slumbers in her mountains or deep beneath the world, crawling out only at dusk or dawn, only at a year's turning, only at the end - and beginning - of things. But even deep beneath, the Goddess moves in the world of dreams, watching, or plucking out the thoughts of gods - and later, men - for Her own purposes.
Description: The thoughts of the Great Goddess move slowly, and so do her plans. Her mind is ancient and her 'words' cryptic. She cares little for the worship of lowly men or the companionship or other gods, weaving her own plans, following her own path. She brings about the changing of ages and the erosion of mountains, guarding the relentless passing of time. The immortal, the unchanging - they are anathema to her, even her fellow gods and, yes, herself. She keeps this hidden, though, wary of the power of her 'kin'. But she will make sure that in the end, even the time of their reign will pass...
Her cults call upon her at twilight, in doorways, cave-mouths and other places of transition and borders, and at the turning of years and days.
There's some things that may not exist at game start - mortals, cults, even stuff like the moon or mountains - so feel to disregard them.